Its because Bank of Indochina was linked with Tahiti issuer.
So, when editing an entry, it empties the bank field. Its why Indomini was “requesting” without wanting it to delete it, when submitting another change.
Bank of Indochina must be reselected in the bank field when modifying something else (as its also attached with French Polynesia).
I fixed that for this case.
but I agree that this mechanism of emptying fields without warning users is confusing and risky. What about a red warning or something like that @Xavier ?