Save draft to document in approval document

[Davin]

Dear All,

 I have issues to save draft to document in the approval document have batch and Bin allocate error (-10) Invalid "SerialAndBatchNumbersBaseLine"; specify a valid "SerialAndBatchNumbersBaseLine" when I using DI API.

My Code 

if(oDraft.GetByKey(Draft_Entry))

{

           oDraft.SaveDraftToDocument()

}

Thanks you