Remapping assets on moving to trash

Using 3.12.1/Postgres every time we go to move an asset with child assets to Trash and choose to remap the trashed parent asset elsewhere by choosing an asset from the Asset Map we get the following error:

[quote]ERROR      You cannot remap URLs of "Old Page Name" to "New Page Name" because it does not have a URL itself. Please choose another asset.[/quote]



I have checked that both the asset being trashed and the new asset, that the old asset is being mapped to, have web paths.



Do I have to deal with all the individual child assets first before re-mapping the parent?



Any ideas?

I believe this has been fixed in a more recent version of Matrix, but I'm sure one of the developers will come past and confirm/deny that.