How to resolve Idoc error status 02

Hi Experts,

I'm creating extended idoc for MATMAS05 and additionally adding one new segment Z1SEG contains 4 fields.

when i'm trying to generate idoc.. i'm getting error status 02 as below

Segment Z1SEG is unknown in Release 701 /

how to resolve this error.. i searched in SDN also but not getting answer for this type of description error .

Thanks to all..

Regards,

Balaji.