Field help (ATBOBLIG)

The field Mandatory is used to define if the field can be empty or if it is mandatory that it contains a value (not empty). An empty field may be a string with an empty length, a null numeric value, a local menu value equal to zero (no choice carried out) or an empty date [0/0/0].

When the field is a key in a table, if the cancellation control is set to the RTZ value, the link cannot be mandatory (because the cancellation can erase the value of the key field) : the Mandatory field is then automatically set to No.