Hi,
Please follow below steps to resolve issue
"Data cannot be maintained for set type COMM_PR_PUR_1"
In SRM System:
1. Go to transaction code COMM_HIERARCHY
2. Search on Hierarchy
3. Select 'R3PRODSTYP' - Product Subtype
4. Go to Category ID 'MAT_'
5. Go to Set type Tab and maintain below entry.
Set Type: COMM_PR_PUR_1
Position: 10
View ID: PURCHASING
View Description: Purchasing