To expand a bit on my last post. If the pz2 you use to inject the morph, does not contain any slaving code, and does not use 'attachFBMdial', then it can't have any effect on the ERC. If it does contain slaving code for "targetGeom a" in "actor b" then it can only affect "targetGeom a" in "actor b", unless some other channel is in turn slaved to "targetGeom a".

If you do want the pose file to contain ERC slaving for some particular channel, but not overwrite some existing slaving in that same channel, then I would need to know the details, before I could give specific advice. In general a channel can be slaved to as many other channels as you want. The only part of slaving code that can be overwritten is the 'deltaAddDelta' value. If there are multiple blocks of slaving code in the same channel, only the 'deltaAddDelta' value in the last block can be overwritten by a pose file.