A320
Deviation / Discrepancy - Procedural Hazardous Material Violation; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Weight And Balance
Flight Crew Became Reoriented; Flight Crew Returned To Gate; General Maintenance Action
Procedure
Flight XXX departed the gate without the required 15 bags securing the Hazmat. Once they returned to the gate; Ramp called and said that the mail in pit 4 is not there due to space. They originally tried to final with the 1200 lbs of mail in pit 4 when it was not. Then I was told that the cargo was split between pit 4 and pit 6. No cargo was shown in pit 6. Everything left the gate in pit 4 but once it came back; changes were made in the [load plan]. They ordinarily could not final due to the Hazmat not being secured but if this wasn't the case; they would have finalized the flight with everything in pit 4 which would be a weight change of 1273 lbs.
Airline Ground Personnel reported gate return aircraft to comply with Hazmat load configuration requirements.