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If you open a table in a database, which is linked to a Calc-table, the table is write protected.
If you want to create a form in the same database with the same table you could choose in the Form Properties "Allow additions", Allow modifications", "Allow deletions" and "Add data only". This properties are impossible for Calc-based databases and some other databases (addressbooks etc.) This properties have to show all "No" and must be inactive.