extended program check ( sapslin prog)

Hi,

i have one requirement, in extended program check for checking the text elements,(chracter -strings).

There is a sap standard programavailabel. ( Code slin,function pool sapslin) , if i am checking EPC for my z program ,the sapling is not comparing the text elements and text literals character by character,It is checking whether the text element is created or not.(for example if i created a text literal as "cat" and for that if i created text element as "ca". ) then also the EPC (sapslin) is not identifying that error.

please guide me with the proper code.