Invoice XBLNR Number range picking incorrect some cases

Hello All,

We are sometimes facing issue that the XBLNR number range is incorrectly populating.

The issue is happening for the Country IT,Where the number range is wrongly picking for some cases.

For example For a B2C customer it is picking the B2B customer number range

Example :Customer X is B2C The defined Number range group is 21

For some cases it is taking the B2B Number ranger group.

The invoices are creating using the background job with customized version of program SDBILLDL(ZSDBILLDL)

Thanks in Advance