Missing required start tag within IDoc-XML

Hi

We are working on migration project, we are facing issue while generating idoc-xml in pi

ERror:

IDOC_ERROR_PARSE_FAILURE: Missing required <EDI_DC40 SEGMENT="1"> start tag within IDoc-XML for type <DEBMAS06>:
state=READING_CONTROLRECORD_STARTTAG, charPosition=88, lineNumber=1, columnNumber=89

In inbound idoc-xml payload in PI , the EDI_DC40 segment is not loading in payload, and we are not passing any partner details in mapping and we made disable the partner details.

Please share your inputs

Rg

Kumar.