[IMP] improved warning messages
[IMP] improved warning message
[MERGE] merged with main addons
[IMP] improved the code
[MERGE] merged with main addons
[MERGE] merged with main addons
[IMP] improved some warning messages
[IMP] improved message
[MERGE] merged with main addons
[MERGE] merged with main addons branch
[MERGE][IMP] More explicit error messages (in delivery, hr_timesheet_sheet, purchase, purchase_requisition, sale_stock, stock)