Hi @Stavros ,
exactly that's the way to go: You have to delete the"non-movable" resources, move the "movable" resources and re-create the "non-movable/deleted" resources.
There is no other way, Really sorry.
At "Move operation support for resources" you will find the "troublemaker resources" in the Microsoft.Insights
section.
(If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)
Regards
Andreas Baumgarten