SAP Message C2256 - Planned order &1 cannot be converted - order network incomplete

Diagnosis
The planned order cannot be converted as the corresponding collectiveorder is not complete. The requirement of planned order &V1& that iscausing this is the dependent requirement or reservation &V2&. Whenreading this requirement, however, no corresponding dependentrequirement or reservation could be found.

Procedure
Start a multi-level MRP for the header material of the leading order inthe collective order.