Diagnosis
In the current period, you added new
reporting points in the
routing and are nowcarring out a
reporting point backflush
for the previous period. This reporting point backflush can result in anegative reference quantity at one of the newly added reporting pointsin the current period.

System Response
You must differentiate between the following two cases:
In the current period, in the routing, you either added a reportingpoint or converted an operation (not previously a reporting point) intoa reporting point. Then the reporting point structure was adjusted by anew cost estimate in the current period. Then, for the previuos period,you carry out a reporting point backflush for the reporting pointwhich, in the current period, lies directly after the new reportingpoint. When posting in the previous period, the system also updates thereporting point quantities in the current period. This may cause thereporting point quantity
(reference quantity) at the
newly added reporting point to become negative in the current period.
The system uses a repetitve manufacturing profile with automatic goodsreceipt at the last reporting point. In the current period, you addanother reporting point after the last reporting point in the routing.Then the reporting point structure was adjusted by a new cost estimatein the current period. Then, for the previous period, you post areporting point backflush at the last reporting point with automaticgoods receipt. Updating the quantities in the current period causes anegative reporting point quantity (reference quantity) at the newlycreated reporting point.

Procedure
In the first case, you can get rid of the negative reporting pointquantity at the newly created reporting point by backflushing anappropriate quantity at the reporting point in question in the currentperiod. If you do not want to post costs in this backflush, you cantemporarily switch off the activity posting indicator in therepetitive manufacturingprofile of the corresponding material (parameter Activities='no activities posted') and you can switch off the goods receiptposting (parameter GR and GI = 'only GR'). Alternatively, in thematerial master record of the material in question, in the MRP view,specify a repetitive manufacturing profile with the above settingstemporarily. Please note that changes to the repetitive manufacturingprofile affects all reporting points for materials with this repetitivemanufacturing profile. You can find the above-mentioned parameters inthe control data on the repetitive manufacturing profile in Customizingfor Repetive Manufacturing.
In the second case, to get rid of the negative reporting point quantityat the newly added reporting point, you first have to temporarilyswitch off the automatic goods receipt at the last reporting point(parameter - Autom. GR = 'no automatic goods receipt whenbackflushing at the last reporting point') in the repetitivemanufacturing profile. Then, in the current period, backflush anappropriate quantity at the reporting point in question. The commentsabove concerning the changes to the repetitive manufacturing profile inthe first case are also valid here.
Once you carry out the reporting point backflush to correct thenegative reporting point quantity at the new reporting point, reverseany changes you made to the repetitive manufacturing profile orre-enter the repetitive manufacturing profile previously used in thematerial master record.