Per bug 32195, there is still at least one way for a patron to end up with a guarantor in a category that does not allow guarantors. When that happens, the patron edit screen does not show one the relationship and therefore the relationship cannot be removed. One should *always* be able to remove an existing relationship. To recreate: 1: have a patron category where CanBeGuarantee is set to Yes. 2: Create a patron in that category, give them a guarantor 3: edit the patron category to set CanBeGuarantee to No 4: confirm your patron still has a guarantor that shows on the details page, but the guarantor no longer shows on the edit screen 5: this means the guarantor cannot be removed :(