Call DB2 stored procedure

[goffinw]

Using the DB2 API Stage,

• I can call a stored procedure instead of upserting: SQL "call apply_rechtstoestand (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?);"
  I cannot define a reject link.

Using the DB2 Enterprise Stage,

• I can define a reject link.
  I cannot call a stored procedure.

Is there any way to call DB2 stored procedures AND to define a reject link?
If not, does anyone have an approach for 'rejects handling', in case I use a stored procedure to apply data to a DB2 database?

Thanks in advance,
Wim