system picking BATCH_CLT instead of BATCH_MAT in COR6N batch determination.

There are two number ranges BATCH_CLT & BATCH_MAT, In COR6N When the batch determination is clicked . the system is taking BATCH_CLT, I want the system to consider BATCH_MAT.

The requirement is for the material types ROH & FRIP the system has to pick internal number range like ROH - 10000 to 19999 & FRIP- 20000 to 29999. for material type SFG & FG, it should be external number range. In COR6N when we click on the batch determination button, the system is picking the batch numbers like 00001, 00002 and ...but the desired is 10000, 10001 .... The exits EXIT_SAPLV01Z_001,EXIT_SAPLV01Z_002 are not triggered

Please suggest how to achieve this.