Material Number not displaying in System

Hi,

We have a Issue with Material Creation BDC that if we back the bdc program by /ne command in append mode, system generates the material number in background but not showing in system.. even in MARA Table or through MM03 t.code..

If we check the number range, system showing the previous material number and next number... but in above mentioned case, why system not showing this material number...

If material number generate in system, then it should display..

Please guide..