When working with table values, it is often useful to able to set an object field to Null. The two ways are shown below:

Classic 4D Command: SET FIELD VALUE NULL(aField)

// Example 1: FIRST RECORD([Table_1]) SET FIELD VALUE NULL([Table_1]obj_field) SAVE RECORD([Table_1])

ORDA: Entity attribute asignment

// Example 2: C_OBJECT($ent;$status) $ent:=ds.Table_1.all().first() $ent.obj_field:=Null $status:=$ent.save()

Be sure to not mix these ways as trying to directly assign an object field to Null without entities will result in an data type incompatibility error.

[Table_1]obj_field:=Null // Incorrect