Unable to delete yellow request for 0material

Hello BW experts,

I am trying to delete a yellow request from 0material attribute but the popup window says "<i>Cannot lock request DTPR_XXXXX of table 0MATERIAL for deletion"</i>

As this is yellow request I am not able to exeute the request again.

We are at latest BW 7.0 14 SP.

Kindly suggest... if someone faced this kind of issue. its urgent.

Thanks

Jagpreet.