I have just finished entering a 3-CD Release, Matthäus-Passion, which I call release/b3d7a…. In its Release Group is another, older, 1-CD Release, Matthäus-Passion BWV 244… (disc 3), which I call release/f6b74….
Disc 3 of release/b3d7a… has identical DiscID to the 1-CD release/f6b74…. Both have same label and catalogue number. The real Release does have 3 CDs, not 1 CD named "disc 3". So, I want to do a merge, I think the merging release/f6b74… is old and incorrect, and the target release/b3d7a… is complete and better-quality.
I tried doing a merge in the obvious way, and it didn't work. From the Release Group page, I selected release/b3d7a…. and release/f6b74…, and attempted a merge. Merge strategy "Append mediums to target release" doesn't apply; I want to end up with 3 Mediums, not 4. Merge strategy "Merge mediums and recordings" looks plausible, but when I tried it, I got a message, "This merge strategy is not applicable to the releases you have selected.".
Why didn't I enter just the first two Mediums of release/b3d7a…, then merge by appending mediums of release/f6b74…? Because I didn't actually enter release/b3d7a…, I added it, based on an existing earlier Release of the same CDs in the Release Group, Matthäus-Passion BWV 244.
What should I do about the stray (disc 3) of release/f6b74…?
Thanks in advance for the help. —Jim