Drawing Revision Codes

Two Control Parameters are provided, Type of Doc Management, to control the sequencing of Revision Codes on Drawings

Original Drawing
Some users do not want the original drawing to have a Revision Number (i.e. it can be Null).
The Control Parameter 'Default Initial Drawing Revision Code' controls this. With no value in this Control Parameter, a new drawing will by default not have a Revision Code. One can be manually added. If the Control parameter has a value (e.g. A), then this value will be the Revision Code on the original drawing

Subsequent Drawing Revisions
The Control Parameter 'Default Subsequent Drawing Revision Code' (values A to Z, 0 to 9) contains the default for the first Revision of the drawing.

Examples:
'Default Initial Drawing Revision Code' has no value; first drawing will have no Revision Code
'Default Subsequent Drawing Revision Code' has value A; first Revision of the drawing will be A

'Default Initial Drawing Revision Code' has value A; first drawing will have Revision Code A
'Default Subsequent Drawing Revision Code' has value B; first Revision of the drawing will be B

Note that duplicate Revision Codes for the same Drawing are disallowed. When the Revision Code reaches Z, the next revision will be AA.  Numeric Revision Codes just increase numerically in sequence.