As task list is not available, we cannot create quality level
but I have a workaround
In QM view, inspection type add DMR for both materials.
When first inspection lot is created,Initially both material will be in initial stage.
Then go to QDL2 Tcode and change next stage to 20 for second material.
Limitation: As we are defining DMR in material level it will be applicable for all vendors who supply this material.
Kindly check if this can help u