The SAP tcode MEK1 is used for:
Create Conditions (Purchasing)
Specifically, MEK1 allows you to create condition records for pricing in Purchasing (e.g., for discounts, surcharges, freight, etc.), based on condition types like PB00, RA01, etc.
You’ll typically enter:
Condition Type
Vendor
Material or Material Group
Purchasing Organization
Validity Period
Price/Discount values