Header Pricing Condition (SD)

Hello,

We have a header pricing condition type both applicable to header and line items. When manually putting an amount on the header, it automatically distributes the amount on the line items proportionally.

When running in batch or IDoc via requirement routines (or any VOFM routines), how can I populate the header amount so that it will distribute the amount automatically also on the line items?

I normally do this on the line item level by modifying XKWERT on a requirement routine but I cannot get it to to work when the target is a header pricing condition.

Please help me if you have any ideas.

Thanks in advance,

John