MRBR report difference qty and amount is not showing

Hi Team,

we have checke the standard report MRBR where system will show the blocked invoices. Here when I ran the report field diff qty and diff amount are coming blank even though it has some difference why it's coming that way . is there any configuration is missing.

ex po qty 100 migo qty 100 mito 110 it got blocked and it's coming mrbr report but diff qty and amount fileds are coming zero values.

Regards,

Raman