Purchase Order Creation could not be initiated. Please check with your system administrator. Oracle

Hllo!

During creating Purchase Order from Sourcing module error occurs:

"Purchase Order Creation could not be initiated. Please check with your system administrator"

but after that I change default language from Polish to English (preferences), and it works correctly and PO is created.

Error occurs while I add to RFQ Requirements to supplier. Does anyone have an idea how to avoid this? PO should be created without changing language to English.

Thank You,

Monika