Adding Backshells after Harness is Flattened

Sequence of Events:

1. Create a 3-D cable in PRO/CABLE.

2. Flatten that cable (create the .mfg file).

3. Go back to 3-D cable and add backshells (routing the cable through a Csys on the backshell, of course),then "Attach to Harness".

4. Reopen the .mfg file.

My Results:

My backshells do not show up. I end up having to delete the old .mfg file and create a new .mfg. Then the backshells show up as expected.

Questions:

1. Anybody else having the same problem with a .mfg file not reflecting the additionof backshells? (And thereby having to create a new .mfg.)

2. Is this behavior "as designed" or am I unaware of a step that needs to be taken in order to have the addedbackshells show up in the original .mfg file?

Thanks for the input!