Thanks for the response.
Sorry about the terminology - I am just an "enthusiastic user" rather than an IT professional. i.e. no formal database training!
The problem was caused by the join between T(1)F(1) and T(2)F(1). When this was deleted, changes to T(2)F(1) cascaded correctly to...
Subset of Database Tables/Fields are as follows:
Table1 Field1 and Field2 values can occur multiple times in the table
Table2 Field1 has a unique value in the table
Table3 Field1 and Field2 when combined have a unique value
Table1 Field1 and Field2 not indexed
Table2 Field1 indexed - unique...
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