Document number field at AR receipts window

Hi Expertees,

We are curretly using document sequence functionalty in AR, once AR invoice is saved automatically both Transaction and the document numbers are getting generated.

While applying the receipt we can able to select the transaction number using LOV, now we are looking that the document number field also should appear as mandatory with LOV, so users can apply the receipt using with document number.

Can anybody please suggest the required setups..

Regards

Narayan