Large Transport; Low Wing; 2 Turbojet Eng
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 15
Communication Breakdown; Confusion; Situational Awareness; Distraction
ATC Issue All Types; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Clearance
Air Traffic Control Provided Assistance
Procedure
Aircraft X; DFW departure ELD transition checked on I issued a clearance to climb to FL330 but put a temporary altitude of FL310 in the data block.  That was my intention to climb the aircraft to flight level 310 because another aircraft was an overflight from the northwest southeast bound I projected the aircraft would be in conflict west of EIC (Shreveport; LA).  The whole time I thought I issued flight level 310 to the pilot.  As I went to transfer communication to Aircraft X I advised him to expect higher on the next frequency but my transmission was blocked by another aircraft.  I observed Aircraft X mode C change from 310 to 312 I called the next sector ELD-H to inquire if they climbed Aircraft X; the aircraft had not checked on frequency yet. The controller broadcast to see the pilot was there they acknowledge the controller advised the pilot to maintain FL320 the mode C indicated 322.I have no recommendation I simply made a mistake I knew for sure I issued FL310 but was totally wrong.
ZFW Controller thinks he issued a lower altitude to an aircraft and put that altitude in the data block.  Controller ships aircraft to next sector and observes aircraft climbing above altitude that he thought he was assigned.