MRP分析报错， Data is Null. This method or property cannot be called on Null values.
MPS分析过程中报错，
是因为料品资料里面的值为NULL
update obas_part1
set storageclass = ''
where storageclass is null
update obas_part1 set lot_rule = '' where lot_rule is null
update obas_part1 set esn_rule = '' where esn_rule is null