Return the Qunatity through P4112

Dear,

As per our scenario , that we issue some consumable quantity to the project site from the main store and sometime the project site return the qty to the main warehouse.

so we allow to user to use the issuance screen for return by using the negative qty with return quantity, but some time users did the mistake they enter the qty more then issue qty. becasue they have no reference while return the qty from the project site .

Please advise this case that how we can control the return qty by using the issuance referece.

Thanks