We realized than allowance % is calculated over amount without taxes. Is there any option to be calculated over amount with taxes?
Our customer has this scheme (allowances marked in bold):
Amount DH/HTVA : XXXX
VAT 20% : YYYY
Amount DH/TTC : ZZZZ
Advanced payment amortization if any : ZZZZ*10% -> ALLOWANCE over amount + taxes
Retention of warranty 10% if any : ZZZZ*10% -> ALLOWANCE over amount + taxes
Net to be paid : WWW