Change Order unsuccessful after being successfully created from SOAP API

We have a requirement of bulk update POs which includes the POET information. We can do the same manually from the screen.

However, when we are hitting the same details via PurchaseOrder API (SOAP) : /fscmService/PurchaseOrderServiceV2 to perform the same task, the CO is getting cancelled after the API response comes as successful.

Error message from PO_report_Table

'You can't change project attributes because accounting has happened on the distribution. '

Error message from PO_history (Screen)-

Attaching the detailed evidences. Kindly suggest.