Hello
Then you should check the schedule agreement and source list validity. Please observe that the validity is checked by MRP against the requirement date, therefore, both schedule agreement and source list must be valid on the date of the requirement that originated the replenishment proposal.
Also check if there is any special procurement for this material. The special procurement (item category) defined on the schedule agreement item must match the special procurement defined on the material master.
If there is a quota arrangement, check if the allocated quantity for both sources is proportional.
BR
Caetano