Manual pricing condition maintained in STO.
Control data in pricing condition in billing document (Condition class B Prices / Calculat.type C Quantity / Condit.category H Basic price / Cond.control E Condition value and basis fixe / Condit.origin A Automatic pricing / Invoice cycle 9 Product value) Group condition checked ON/ Split IV checked OFF.
STO has item with qty 10. (Pricing condition maintained)
Delivery document created with partial qty 5. (No pricing in Delivery document)
Billing document created with partial qty 5. Qty field on condition tab in billing document shows 5 but Condition value is same as condition value in STO which is the value for qty 10.
Pricing condition in billing document is not considering partial qty from billing or from delivery document. It goes back to STO and get the condition value from there for total qty.