Here are the steps to make a read only field ""importable"" in the data dictionary. I have used this to import to the average cost field successfully. Props to Alnoor for sharing this.
Description:
Allowing Import to read only file in MAS
Details:
How to modify VI Data Dictionaries for 4.x framework
DFDM MAS90\providex.ddf
Lookup by name to find the VI entity to modify - get the key ID.
DFDM MAS90\providex.dde
Search by Key. Find the field record you want to modify
Edit field 20 (15,1) a zero is importable. a 1 is read only.