create function : change name of input parameter

Using Postgres Version 9.0.4:

We are migrating our Sybase stored procedures to Postgres and need to be able to drop/replace the SPs, making needed changes to input parameters to fix issues/differences between Sybase and Postgres.

However, we keep getting this error when we drop/replace the PG/SP:

'ERROR : cannot change name of input parameter'

The 'create function' documentation states:

'You cannot change the name already assigned to any input parameter (although you can add names to parameters that had none before).'

Other than a complete restore of the database from a dump that does *not* contain the original SP...is there any other way to override this constraint?

This makes debugging *extremely* difficult. If you don't have your input parameters completely correct the first time...you're hosed.

Many thanks.
Lori

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