Adding Used DC under CRMWEB gives error " .dcdef checked out by others"

Question

Hello E-Commerce Experts,
We need to extend E-Commerce 7.0 b2b application (claims and returns). After much struggle, we could finally deploy the custom application. We now would like to extend it and have new fields added.
We need to to defined a used dependency in the web module project crm/eservice/web/cr_b2b for customer extension DC provided for java action classes (crm/home/crm/ext) but are getting an error saying:
DC definition could not be checked out: the file .dcdef is checked out by others. None of the objects have been checked out by any other developers.
Please advise as to how to resolve this error.
Additionally, we would like to add CRMJAVA SC as a development component, so we could refer the existing java files. But we are not able to import it properly. It shows up as an empty SC in NWDS after being imported.
Your help would be highly appreciated.
Thanks!

Answer 1

I was able to resolve my error. I had created some other instances of the same project under a different workspace.
Follow these steps for every workspace  you might have created your project in (except the current workspace):
For every open activity ( Windows -> Show View -> Open Activities)
- Select your open activity  -> Right Click -> Revert  and then Delete the activity  (Right click -> delete)
Delete all your open activities.
Open your current project and Resync all DCs.
Now try to add used DC for the web module project.
It should work.