No WIP at actual cost allowed in Product Cost by Period

Message type: E = Error

Message class: KJ - Cost Object Controlling for Make-to-Order Production

Message number: 120

Message text: No WIP at actual cost allowed in Product Cost by Period

What causes this issue?

In Product Cost by Period,
<DS:GLOS.3526B774AFAB52B9E10000009B38F974>work in process</> can only
be calculated at target cost. This is because the
<DS:GLOS.3526B637AFAB52B9E10000009B38F974>variance calculation</>
process only calculates variances by period, so WIP at actual costs
would not be included. This would result in actual costs being settled
more than once.
You are using Product Cost by Period if there is a periodic
distribution rule in the
<DS:GLOS.3526B633AFAB52B9E10000009B38F974>settlement rule</> that
settles to material with a percentage of greater than 0.