1. Set a min of 1 and max of 6 for C_OrderLine.QtyEntered2. System allows you to save order line with QtyEntered < 1 or > 6
https://bitbucket.org/idempiere/idempiere/commits/67345f5
this patch solved the problem with :
Entered value is less than the minimum (1) required: Day of the Month
in window "Schedule" and "Scheduler"
1. Set a min of 1 and max of 6 for C_OrderLine.QtyEntered
2. System allows you to save order line with QtyEntered < 1 or > 6