Number ranges for MIRO Documents

Hi Experts,

I'm working as ABAP Consultant. we are working for a client, the client requires a different number range for different plant and for the different document (like we have Invoice, Credit memo, Subsequent credit and debit ) in MIRO T code.

we found a user Exit (LMR1M003) Here I have export parameter E_NUMKR (Number Range). The functional guy created one document type and number range in mir4 transaction. if I that assigned that number range to this parameter document is not creating.

Please suggest me a solution. ( if possible with code )