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There is no need to change a procedure interface - never ever. The clean way is, to add a new pocedure with the modified interface, after this making changes where ever the modification is needed, if nobody is using the (deprecated) procedure it could be removed if somebody wants to remove. As a note aside: the new peocedure and the deprecated procedure could share most of the implementation logic.
BTW: same is true for most changes to PFs: use views only to access tables and don't change a view - never ever!!!
D*B
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