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FRM-41060: Cannot disable Primary Key Property of only key item.

Cause:  You attempted to turn off the Primary Key property on the last primary key item on a block with one of the following:

1. The Primary Key property.

2. Key mode of the primary key.

3. The database to which you are connected does not support UNIQUE key mode.

Action:  Disable the block properties first.

Level:  20

Type:  Error