Skips PERFORM in normal execution

Scenario :

ALV display of output has a custom button which when clicked

brings to the below mentioned piece of code based on the check for the SY_UCOMM.

PERFORM f_local_account_criteria..

SORT t_tmp1_output BY saknr

zfxxfieldval.

During normal working it skips the perform and hence the internal table t_tmp1_output which has values appended in the perform

has 0 entries.

But when a debug point is placed on the perform and normal F5 is done till one enters the PERFORM , it then does the operation inside the perform and the internal table has values.

Please help in case you have encountered anything as such and resolved it ...