Credit memo request

Dear Gurus ,

I hv created Four sales document types ,I maintained four different pricing procedures for each sales doc type .

Assigned different doc procedure indicator as follows .

Sales doc type doc pricing proc indicator Billing type

ZS1 A ZF1

ZS2 1 ZF2

ZS3 2 ZF3

ZS4 3 ZF4

Now i want to create credit memo request ,

DO is there any way that i hv to confgure only one credit memo request document for referreing above different billing types.

Because it is showing error for pricing procedure determination.

Pls suggest should I configure four different credit memo request for that or not .

Thanks in advance .

Anchal Pawar