Message SAP WM221 - You are assigning mats. to assortment & - they are not defined there

Diagnosis
You are listing a material in an assortment although the material groupof this material is not defined in the material group assortmentmaster. This could result in an illogical assortment (such as deepfrozen goods in a plant without the necessary equipment, for example).

System Response
You are only given the chance to respond to this error if you activatethe "Display / Process listing errors" flag. If you do not, theincorrect plants will simply be excluded from the listing.

Procedure
Reset the selection flag for the assortment (then no listing willoccur) or ignore this error (and a listing will then take place).However, you should only do this if the consequences of this action arecompletely clear to you.