Switching two measures

Hi,

I am having a problem in this measure. It says in the report: A table of multiple values was supplied where a single value was expected. So my target is to switch the measures when the invoice months is (Jan,Feb,Mar). The error pop-up when there is no selected month. Is it possible to display it monthly?

Dealer Base (Tenured):= IF(VALUES(DATE_INVOICE[MONTH]) < 4, [Dealer Base Tenured], CALCULATE([Dealer Base1], FACT_OFF_TAKE[DL_CLASSIFICATION] = "TENURED"))

SUB METRICS:

Dealer Base1:=CALCULATE(DISTINCTCOUNT(DIM_DEALERS[DEALERS_KEY]), FILTER(DIM_DEALERS,NOT(ISBLANK([Transaction Count DealerBase]))))

Dealer Base OLD:=CALCULATE(DISTINCTCOUNT(DIM_DEALERS[DEALERS_KEY]), FILTER(DIM_DEALERS,NOT(ISBLANK([Transaction Count P4M]))))

Dealer Base Tenured:=CALCULATE([Dealer Base OLD], ALL(FACT_OFF_TAKE[DL_CLASSIFICATION])) - CALCULATE([Dealer Base1], FACT_OFF_TAKE[DL_CLASSIFICATION] = "CURRENT YEAR RECRUITS")