CCRRTT000002100E Invalid backlink between tasks. SourceTask=XXX ProxyTask=YYY ProxyTaskLink=ZZZ. (ERR_INVALID_BACKLINK)

Description

The proxy links between a set of tasks was not created properly. There might be duplicate source tasks in the source repository all pointing to one task in the proxy repository.

For example, this problem occurs when synchronization is attempted on source task ST1, which points to proxy task PT1, but the proxy URL on PT1 points to a different task in the source repository, ST2. It might be that ST2’s proxy URL is PT1, and so ST2 and PT1 have a valid proxy connection, and ST1 is a duplicate task.

The error reoccurs as long as ST1 exists in the source repository.

User Action

Delete ST1 from the repository. This leaves a synchronization association between ST2 and PT1 set up and functioning correctly.