When i try to use a stored proc for updating a table. For example your

customers table using strataframes own Customers_Update , I receive the folowling error "Procedure or function Customers_Update has too many arguments specified."

Can somebody tell me why this is or at least how to try and debug it

When you configure a business object so that the PrimaryKeyIsAutoIncremented property is False, that _ORGPK value is used to find the record on the server since you could conceivably change the PK value (since it's not an IDENTITY field on the server).  So, yes, on your table that is using a non-integer, non-identity PK, you'll need to include the extra value in the parameters list.