STO through Idoc

Hi Gurus,

******Happy New Year********

Iam trying to create a STO through Idoc, system is showing an error after creation of IDOC.

" Please enter a valid delivery date".

We never enter a delivery date while creating a PO manually, it should reflect from either inforecord/material master data, why the same is not happening through IDOC.?

I hope my question is clear

regards,

prasad