Create service agreement from external Application using AIF SMAserviceAgreementService

I am trying to create ServiceAgreement in Ax from external application(scribe or .net) using out of the box AIF service (SMAServiceAgreementService).

this service only available for read operation, so I modify the service for create operation also .

when I try to create ServiceAgreement from external application ,I get error “Document Service Agreement does not support the create-method.” in Ax exception log.

Please any one give me solution to over come this issue.

Thank you