Hi Josef,
Please go to OMS4 and check the material plant specific status for Y1 and Y2 for Mat. Cost Estimate Procedure.
Also check components of BOM for plant specific status it should be Y2 for all you components.
One of the materials to be costed has a material/PPS status which does not allow a cost estimate.
CS03 you can check the BOM components and CS12 for multiple BOM explosion.
Regards,
R.Brahmankar