Exactly same issue for me.
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Exact same thing is happening to me:
{
"errors" : [ {
"id" : "<id>",
"status" : "409",
"code" : "ENTITY_ERROR.RELATIONSHIP.INVALID",
"title" : "The provided entity includes a relationship with an invalid value",
"detail" : "You cannot create a new version of the App in the current state.",
"source" : {
"pointer" : "/data/relationships/app"
}
} ]
}