In the routing transaction (CA01) there is a reference sequence field on the sequence detail screen. Use of the field allows parallel sequences to be created that return back to a sequence other than Sequence 0.
In the production order transaction CO01 the reference sequence field in not available on the sequence detail screen for production orders.
A production order created using a standad routing (type N) that includes a parallel sequence defined with a reference sequence field value other than 0 (main sequence) fails to import correctly. Parallel sequences that have a reference sequence field value of 0 import correctly. There is no error message or warning.
We are on R/3 4.6B and upgrading to ECC 6.0. The problem exists in both versions.