PO from SO via DI API:Base document card and target document card do not ..

HI All,

I am trying to create Purchase Order from Sales Order. This is possible by GUI (on Sales Order on logistics tabs Click On Purcase Orders CheckBox.

I got the error message: -5002-Base document card and target document card do not match.

The message itself can be understandable, because the Customer and Supplier has a different CardCode.

I am sure I am using a correct code

oPo.Lines.BaseType = BoObjectTypes.oOrders
oPo.Lines.BaseEntry = sDocEntry
oPo.Lines.BaseLine = iLineNum

Where oPo is a Purchase Order document.

sDocEntry is a Sales Order docentry and iLineNum is a Line number of Sales Order

For other A/R to A/R and A/P to A/P documents are working fine.

Has anybody found this error or has anybody created application like this?

I am using sbo2007PL46

Regards,

J.