CK426 - no valuation type

Hi colleagues,

Upon settling a CO production order I receive CK426 saying that there is no valuation type for my material.

We have individual batches and we do several MIGOs from this order not necessary with the same batch number and valuation type, however we tend to keep the same batches for a particular order.

Meanwhile, in the order master data I'm unable set the valuation type even the batch number. When I go to extras and valuation I can put the valuation type from a library which is in transaction OMWC but I can't see existing valuation types for this or any materials.

What's the story on this?

THanks

HJ