RPOSN is not filled

Hi all,

the reference line item (RPOSN) is not filled. Here you are some information:

1. the summarization of actual data is active for the business transaction SD00

2. the RBELN is filled

3. the fixed characteristic RPOSN is not used for the creation of result objects (KEQ3)

How I can update RPOSN field?

I'm working on SAP Release 4.7

Thanks

Sara