Fieldcatalog Merge in Alv report

Hi friends,

while i am using field catalog merge in report (REUSE_ALV_FIELDCATALOG_MERGE)

the report shows a dump error "The ABAP program lines are wider than the internal table.".

so i have removed the fieldcatalog merge FM and i used fieldcatalog directly then i got the output perfectly..

How can i use fieldcatalog merge .

regards,

sateesh.