the below given coding is given sy-subrc = 0 .
here T_ZISUBPTOPREMISE1 is an internal table of type database table ZISUBPTOPREMISE , having structure
BPEXT BU_BPEXT --- Primary Key
PARTNER " Business Partner Number
BPKIND " Business Partner Type
BPEXT " Business partner number in external system
BU_SORT1 " Search term 1 for business partner
BU_SORT2 " Search term 2 for business partner
TITLE " Form-of-Address Key
NAME_FIRST " First name of business partner (person)
NAME_LAST " Last name of business partner (person)
FROM BUT000 INTO TABLE T_BUT000
FOR ALL ENTRIES IN T_ZISUBPTOPREMISE1
WHERE BPEXT = T_ZISUBPTOPREMISE1-BPEXT .
What should be the reason behind it?