AUTOCREATE - PO Headers - SHIP TO - Defaulting

Hi,

I would like to know, how the SHIP TO in PO header is defaulting when we AUTO CREATE a PO from Requisition. Is there any field in Requisition which can override the Default ship to from Supplier Site?

We have a requirement and tried to customise the SHIP TO location Default to a single Value. But this is not working.

I would like to hear the recommendations on how to override the Supplier Site Ship to when we create a PO by AUTOCREATE process. Any one has done any such analysis (on understanding how AUTO CREATE takes fields from Requisition to PO Header) or development, kindly share with me.