Double budget is consumed when parking invoice with retention

Dear Experts,

There is an contented with fund depletion during parking invoice done MIR7 wherever retention is indicated. System releases fund depletion connected PO level and consumes triple fund connected Parked invoice (value benignant 60). Once parked invoice is approved and posted, strategy releases other consumed budget. Field FMFIIT-MENGE (quantity) for parked invoice appears "3" alternatively of "1". No specified contented arises erstwhile invoice is straight posted done MIRO.