How to compair all line item field values

[Monikakathore]

I have line item itab ' lt_item' so there is field 'Zcomp' ...so i want to put condition that if all entries of Zcomp  = 'A0' then call class_xx  else leave. ....so main question is how to check one entries with others if they are similar or not ...

[Sandra_Rossi]

Not very clear what the question is. If you compare one item, and it's NOT equal, it means that all items are NOT equal.