Hi Muhammad,
Refer the following link for your reference in terms of Conversion of units from two different UoM family
Refer Scenario 2 in following SAP Link:
- Delivery Unit of Measure - Logistics Execution (LE) - SAP Library
Also consider, batch management while doing GR for the goods. Refer the following discussion to take care of that.
- Unit conversion for units from different UoM fa... | SCN
Moreover, your pricing condition type ought to have Calculat.type as C-Quantity.
Thanks, JP