NAT0901 at compiling time

Hello Fellows,
I would like to know if someone of you heard something about record size limit in the SORT BY statement under Natural for Linux. I am trying to check a program which has the SORT statement but it fails whith the NAT0901. That errors says that the length of record to be sorted exceeds 10240 bytes. One tips that program was downloaded from the MF.
I really appreciate your helps.

Best Regards,