Process Order confirmation - Activity hours not reclaculated

Hi,

We recently upgraded from 4.6C to 6.0. We use CONF21 idocs to process confirmations. In 4.6C, with the quantity the activity hours were recalculated. But it is not happening in 6.0. Should we use a different program or is it a setting that we are missing?

FM linked to CONF21 - PROCESS_CC2_MESSAGES_PARALLEL

Thanks,

Shalini