You will have to write a patch program, which will update the invoice document reference in the assignment field, based on the billing reference ( in reference) field.
1. Create BDC for FB02 , the recording should be done to update the assignment field. Convert the same to the program. ( can take abaper's help)
2. Now select the data form bkpf for "BLART" = 'RV" for the selective date . Establish its relation ship with J_1iexchdr for trntyp = 'DLFC' and rdoc = BKPF-awkey, if found update the exnum from j_1iexchdr to awkey of bkpf.
3. Supply this file to the BDC program , this will update the invoice number and during fbl5n, select the field assignment , were the excise number is updated.
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