
Use
CLEAR ( <parameter> ).
This function clears the contents of the parameter -that is, it initializes the given field or fields. <parameter> can be a:
Simple parameter
Field of a structured parameter
CLEAR ( <structure>-<field1> ).
Complete structure
CLEAR ( <structure> ).
Complete table row
CLEAR ( <table>[<index>] ).
Complete table
CLEAR ( <table> ).