referring to the drawings in particular , fig1 , 2 and 3 schematically show a commissioning unit 30 for commissioning individually packaged products with automatic commissioning units 31 along with associated central belts 32 and coordinate flow shelves 1 as a reserve for filling the automatic commissioning unit with individually packaged products in a plurality of blocks b 1 , b 2 , b 3 . the individually packaged products are transported automatically to a flow shelf 1 in containers or cardboard boxes 2 in each block b 1 , b 2 , b 3 on a driven conveying section , or a container feed section , 4 . the individually packaged products in containers or cardboard boxes 2 are transported each in such a way that they are all of the same kind , and after reading and recognition , they are automatically introduced via an activated stationary elevator 5 and activated level control units 6 of the flow shelf 1 into selected throughput channels or ramps 3 of the flow shelf with outlets a that can be reached by a human operator 17 by hand . mixed filling of the containers or cardboard boxes 2 , in which case the individually packaged products are not consequently introduced such that they are all of the same kind , is advantageous for very slowly moving individually packaged products . after manual removal of the containers / cardboard boxes 2 at a selected outlet a of a throughput channel 3 and unpacking of the containers / cardboard boxes by a human operator 17 , the individually packaged products are introduced into commissioning shafts of the automatic commissioning units 31 . these shafts are to be refilled , in such a way that they are all of the same kind . in particular , each block b 1 , b 2 , b 3 includes a driven conveying section 4 in the form of an accumulating roller conveyor , as well as a flow shelf 1 with sloped throughput channels 3 in a plurality of bay levels i , ii , iii , iv , v , preferably three to five bay levels , whose outlets a can be reached by a human operator 17 . the flow shelf 1 contains a displaceable , track - guided level control or conveyor unit 6 in each bay level i , ii , iii , iv , v for automatically filling the throughput channels 3 with containers / cardboard boxes 2 , which contain individually packaged products that are all of the same kind . furthermore , the flow shelf 1 has a stationary elevator 5 connected to the conveying section 4 for the automatic transport of the containers / cardboard boxes 2 from the conveying section 4 into each selected bay level i , ii , iii , iv , v . the flow shelf 1 also has a buffer section 7 each in each bay level i , ii , iii , iv , v connected to the elevator 5 for an automatic takeover of the containers / cardboard boxes 2 from the elevator . each buffer section 7 has an outlet that can be automatically approached by the level control or conveyor unit 6 , wherein said level control unit can take over a container / cardboard box 2 for horizontal transportation to the inlet e of a selected throughput channel 3 . the level control / conveyor units 6 are guided by guide rollers in horizontal braces of the flow shelf 1 , designed as rails 8 . in particular , the flow shelf 1 is designed as a double bay , and the level control units 6 can be displaced horizontally in the direction of travel f in a central bay aisle r of the double bay and are positioned at the outlets of the buffer section and at the inlets e of opposite throughput channels 3 . the level control unit 6 has a load pickup or carrying means with drivable rollers 9 , whose axes extend in the direction of travel f of the level control unit 6 and at right angles to the throughput channels 3 , as this can be seen especially in fig4 through 8 . the load pickup / carrying means has , in the area of the axial ends of the rollers 9 , a stationary lateral railing 20 , 21 each at right angles to the direction of travel f . the distance between the two lateral railings 20 , 21 can be set , and the distance set corresponds to the width of a container / cardboard box 2 . only the front railing 20 is provided in the exemplary embodiment as an adjusting means , which is located at the edge of the level control unit . the two lateral railings 20 , 21 extend at right angles to the direction of travel f . the level control unit 6 may be positioned at the inlets e of throughput channels 3 having different widths , and the distance between the two railings 20 , 21 is always set to the width of the activated throughput channel 3 . the level control unit 6 has , furthermore , an electric drive 13 , which is preferably connected to a stationary conductor rail via sliding contacts 10 . the electric drive 13 has a shaft encoder , with which the distance traveled by the level control unit 6 can be measured . the level control unit 6 is equipped with two sensors 11 for recognizing the state of filling of a throughput channel 3 . conveying section 4 has a recognition means for recognizing a fed container / cardboard box 2 and for transmitting the data of the container to a central computer , which brings about fully automatic operation of the feeding of the containers / cardboard boxes along with sorting in the throughput channels 3 . the conveying section 4 is arranged overhead and makes possible free passage to the commissioning bay as well as the flow shelf . the conveying section 4 has a connection section 4 ′ for adjacent flow shelves according to fig1 . the flow shelves 1 are provided in a parallel arrangement . each flow shelf 1 is composed of a plurality of bay modules m , which are located one after another and in the direction of travel f of the level control units 6 . the throughput channels 3 have a short longitudinal extension and have two lateral roller strips 19 , and adjacent throughput channels 3 are separated from each other by separating webs 12 . a throughput channels for rejects 15 is provided in the area of the buffer sections , in which damaged or unidentified containers / cardboard boxes 2 are sorted out and further processed separately . the level control unit 6 consequently has rollers 9 as load pickup / carrying means . the rollers 9 are driven and can pick up and release a container / cardboard box 2 at right angles to the direction of travel f . the level control unit 6 travels on running rails 8 . the level control unit is driven in the embodiment variant described with a so - called omega drive according to fig7 along a fixed toothed belt . the toothed belt runs as in an omega around the drive roller . the motor of the level control unit has a shaft encoder , with which the distance traveled can be measured . the level control unit thus knows its position and can be positioned in front of the desired throughput channel . the drive may , in principle , also be designed as a frictionally engaged drive with wheels . the level control unit is held by guide rollers in a fixed position in relation to the flow shelf , because the rails 8 are part of the flow shelf . by switching on the rollers , the level control unit can pick up containers / cardboard boxes 2 from the conveying means and release same into the throughput channels 3 . a throughput channel 3 is formed from two or more roller strips 19 and limited by separating webs 12 . the level control unit 6 is equipped with sensors 11 , which makes it possible to recognize whether a throughput channel 3 can still take up a container / cardboard box 2 or the throughput channel is full . this can be performed with a sensor 11 , which is able to measure the distance from the next obstacle ( e . g ., optically or with ultrasound ). however , a reflector may also be arranged per ramp , and a photoelectric cell checks whether the path to the reflector is clear . if the photoelectric cell sees the reflector , the channel is clear . sensor 11 may also be used to check whether a container / cardboard box 2 was released correctly into the throughput channel 3 . in case of containers 2 of different widths and throughput channels adapted to the width , the container / cardboard box 2 must be aligned at a defined edge . this is the front edge 20 of the level control unit 6 in this case . the alignment at the railing can be carried out by the container / cardboard box being taken over already in the aligned position from the conveying mechanism in another embodiment variant . however , provisions are primarily made for the railing 20 to be designed as a displaceable railing in order to obtain the desired alignment . simultaneous measurement of the product width is also possible with the displaceable railing 20 . deviations between the channel width and the product width can be recognized as a result . the elevator may be equipped with different elevator platforms . the platform has a single depth in the simplest variant , i . e ., only one container / cardboard box 2 can be carried per trip . it is also possible , in principle , to build platforms of double or multiple depth in order to make it possible to transport a plurality of containers / cardboard boxes per trip . depending on the arrangement of the conveyor mechanism , the elevator may operate as a so - called c conveyor or s conveyor . “ c ” means that the container / cardboard box describes a “ c ,” i . e ., the container / cardboard box enters in one direction and leaves in another direction . in an “ s ,” the container / cardboard box moves away from the elevator in the same direction . while specific embodiments of the invention have been described in detail to illustrate the application of the principles of the invention , it will be understood that the invention may be embodied otherwise without departing from such principles .