Field help (GACTYPCTL)  

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This field determines how tax codes are entered in the Tax control grid. If you change the Control type, all codes are removed from the grid.

Inactive: You cannot enter tax codes in the grid.

Authorization: The Default tax code must be included in the list. If you change the Default tax code, the new code is automatically added to the next open line.

Restriction: You must enter at least one tax code. The default tax code cannot be included in the list.