SAP CPQ Formula Rule

Dear experts,

Could you please assist me with how can I convert this requirement with the formula rules?

Attribute: ZTCATI value: KT

Attribute: ZTAP value: D

Attribute: ZTCATIKAL value : KC

If ZTCATI==KT and ZTAP != D

result: ZTCATIKAL !=KC

Thank you,

Mehmet