Impossible to supress request from DSO

Hi experts,

I am not able to supress a resquest from a DSO (3.5 flow), I tried to supress it by setting it in red but i have the following error:

Request is already (partially) activated; no further QM action possible

At first vue, the request seems to fine (all green)

But when i go to details tab, i have this:

I tried to change its status using FM RSS2_DTP_RNR_SUBSEQ_PROC_SET and RSBM_GUI_CHANGE_USTATE. But it's not working.

Does anyone already faced this error?

Thanks.

Amine