6.2.3.1 Segmentation Considerations
A GO TO statement in a section whose priority is greater than or equal to 50 must not be referred to by an ALTER statement in a section with a different priority. All other uses of the ALTER statement are valid and are performed, even if the GO TO to which the ALTER refers is in a fixed overlayable segment.
Altered GO TO statements in independent segments are returned to their initial states when control is transferred to the independent segment that contains the ALTERED GO TO from another independent segment with a different priority.
This transfer of control can take place because of:
- The effect of previous statements
- An explicit transfer of control with a PERFORM or GO TO statement
- A sort or merge statement with the INPUT or OUTPUT phrase specified
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