restrict invoice to a different company code

Hi,

I need settings for to STOP cross company transaction postings.

Example: I have created a Purchase order for 1000 company code and GRN for 1000 company code but while doing Invoice for different company code 2000 it is not showing any error message.I want an error message while doing invoice for different company code transaction postings.Please suggest me the settings need to be done.

subject changed to reflect the content of the question: Jürgen L