Make "Responsibility" field in PIR Mandatory

HI,

I have a requirement to make responsibility field(Table - KONH Field -KZUST) which is shown in the Conditions Tab>> Header (Hat button) on PIR  as a

mandatory field

. On analysis i found out that this field is not there in the PIR screen layout in the configuration as it flows from the VK11 transaction (create condition records). Can someone please help me with configuration to make this field mandatory. Thanks in advance !

Vipin