SAP_REORG_UPDATERECORDS Cancelled

Dear Gurus,

Standard job SAP_REORG_UPDATERECORDS cancelled in my ECC6.0 server what could be the problem i have checked in the job log it showing please help me needfull...

05.02.2008 03:23:06 Job started 00 516 S

05.02.2008 03:23:06 Step 001 started (program RSM13002, variant SAP&001, user ID BASIS) 00 550 S

05.02.2008 03:23:14 Reorganization of update date not allowed in batch 15 100 A

05.02.2008 03:23:14 Job cancelled 00 518 A

Thanks in Advance

Regards

Chandra