Difference between Tcode ML81N and BAPI_ENTRYSHEET_CREATE?

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Hi SAP Gurus,

We are trying to create Goods receipt for Service items in PO. Currently we are using Function module BAPI_ENTRYSHEET_CREATE. This Function module creates Entry sheet and its corresponding Material documents..The material documents created thru bapi are not equal to SERIAL_NO in accounting assignment at PO item level(ie; material

documents are created more than the

Account assignment summarized lines).But same item

created thru Tcode ML81N,giving equal number of material documents with its corresponding SERIAL_NO....

(ie; material

documents are created equal to the

Account assignment summarized lines)

can any body tell me why this difference happening ....?

Your help highly appreciated..

Regards

Dinesh.A