If you haven't done so already, please do the following actions. This should fix the broken link and/or make the transaction removable.
Validate and Supervalidate instructions
First save a backup file prior to performing these steps
Validate:
Super Validate:
Chris_QPW said: Well, when Quicken gives that error message about not being able remove/change it on this side of the transfer it is because that other side is a split transaction with this transfer as one of the split lines.So, check for a split on the same day as the original account.If that doesn't find it, try Super Validate and Repair.Hold down the shift and ctrl key and select File -> Validate and Repair File..., and then select "Super validate file" checkbox and then OK.