Change message QB301 from error to warning

Hi everyone,

How do I change message QB301 to a warning message.

QB301 = "Vendor's/manufacturer's QM system only valid to 04/30/2010"

My user requirement is to maintain the Required QM System for Vendor/Target QM system (MARC-QSSYS) for the material and in the quality inforecord maintain this with a validity date.

However it is a requirement to only receive a warning during PO creation if the QM system is not within validity date. Standard SAP issues message QB301 as an error.

I have tried to add this message to OMT4 in Purchasing, but this particular message is not allowed here.

For QM control key (0005 maintained in material master) the setting is set to Warning, but this does not affect message QB301.....

Do you have any suggestions?

Thank you in advance

Judith