Data Mismatch in slamonthly file

Hello Experts,

in slamonthly table, there is one field called "year". Invalid input is coming to this field like 0, 1, 2 etc.

I am trying to troubleshoot from where data is populating to this table? I am not getting any kind of lead. Please help.

Waiting for your valuable inputs.

P.S.: There is no Object and Format Control record for slamonthly table.