spl block while changing document

Hi,

We are getting SPL block for a quotation document when we change the business partner communication data (partner tab) in the document.

In SPRO we have only the name, city, street fields in the Address Comparison procedure and I assume communication data fields are not considered for screening.

So which fields does the system actually consider for changes during the screening document and blocking ?

How can we avoid a field from screening ?

Thanks

Sudesh