"Wrapper" is very familier word for ERP developer. If you are working in Baan ERP software you will come to situation where you need to modify functionality of Standard session. In those situation you need source code of that session which is usually not available at Client Place. Then you need to have something which do something prior to actual events.
ERP LN has concept of User Exists which execute before Dal hooks. For this you need to create one program script with extension ".ue". In this script define extern functions such as "before.before.display.object()" for "before.display.object()" in DAL. This "before.before.display.object()" function will get called prior to actual Dal hook.
Similarly we can define before and after event of every DAL Hook in User Exists. There is no provision for field level checks. It is only works for DAL Hook.
I will explain it with example..........................
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