need help for solving circular dependency

Question

I need to calculate a column with an IF() function based on two tables, but I receive a circular dependency error.

have the data model as shown in the image below.

I have two columns called A and B in my fact table, and a column named "employed more than 3 months" in my employee dimension table. (please ignore the other columns)

What I need is to have a column as following in my fact table:

C= A- B

and then I need to have a column which produce the result as follow:

result= IF [C <= 0 AND [employyed more than 3 months] = 'True'
THEN [C]
ELSE 0
END

I tried to create a calculated column with CALCULATE() function, but I receive a circular dependency error.

can someone help me create this?