Issue with fixed Bin assignment during Replenishment

Hello,

I am facing an issue with fixed Bin assignment. I am following below steps:

1.At Storage type (ST01) level set flag for "Use Fixed Bin"

2.Go to t-code /SCWM/BINMAT and maintain below entries for Bin :

Storage Type -- Bin -- Product -- Max Qty -- Min Qty

ST01         -- B01 -- Prd01   -- 20      -- 10

ST01         -- B02 -- Prd01   -- 30      -- 15

3. Once above entries are maintained replenishment is run and warehosue task gets created for

   destination Bin B01 and B02

4. Once task gets created , confirm them in the Bin B01 & B02.

5. Make Bin B01 empty by moving the stock from Bin B01 .

6. As soon as Bin gets empty ,Entries maintaned for B01 in /SCWM/BINMAT gets deleted automatically.

7. I believe it should not get deleted automatically , since I have maintained them manually

   in T-code /SCWM/BINMAT

Please suggest.

Thanks,

Abhishek