Output Condition

I need to give an exit condition for an object in a report in which the field is text, I apply the following but it doesn't work:

<<Calc(<<TABLE.Field>> = "4-MP.-blablablabla")>>

It doesn't work for me either:

(<<TABLE.Field>> = "4-MP.-blablablabla")

because the following, which is what I really want, does not come out:

in a -Column - Discrete Graphics us depth properties- ( Column - Discrete Graphics us depth properties)

"Column" tab

"Column Header Label" field

If the text string is "4-MP.-blablablabla" in the field I want, then put "ABC" as the field title, otherwise "A".

I would like to implement the latter in the Column tab of the table, in which the expression to put would be more or less:

  IIf<<TABLE.Field>> = "4-MP.-blablablabla" OR <<TABLE.Field>> = "5-MR.-blablablabla", then it shows "ABC", otherwise, it shows "A"

  IIf<<TABLE.Field>> = "4-MP.-blablablabla" OR <<TABLE.Field>> = "5-MR.-blablablabla" then "ABC", IIF not, then "A"

This field is defined as a library data lookup field or dropdown field. The table is called A and the library table is also called A, which is why I don't know if the query doesn't work out because of that.