Diagnosis
The combinations of items and product groups overlap.
For example, suppose you have defined that the range of product groupsPG1 to PG3 is assigned to item 100000. In this case, you can not at thesame time define that the range of product groups PG3 to PG5 isassigned to item 110000. This is because product group PG3 would beassigned to both items 100000 and 110000.

Procedure
Make sure that no combinations of items and product groups overlap.