SAP LOOP GUIDL documentation, setup help and example usage

GUIDELINE

Loop Processing

ABAP_BACKGROUND
Alongside the statements for editing individual rows in internal tables, other statements can be used to address and modify the entire body of the table. Examples:

All categories of assignments applying to whole internal tables

Deleting the whole of an internal table using CLEAR or FREE

Operations in target ranges such as SELECT INTO TABLE

These types of accesses to the table body cause problems by producing a loop across the internal table

ABAP_RULE
Do not modify the entire table body in a loop
You cannot use a loop across an internal table to perform accesses to the table that modify the entire table body at once.

ABAP_DETAILS
A modifying access to the entire table body usually produces a runtime error and at the very least unpredictable program behavior. If this can be detected statically, a syntax error occurs within classes and also in
LOOP s with a statically detectable secondary key when the table operations in question are used. Otherwise, the syntax check simply retu
rns a warning for compatibility reasons.

Note
This rule is mainly intended to make you more away of the problem. If you only work with ABAP Objects or if no syntax check warnings are ignored, then the rule above should be kept automatically.