problem with dax code in a measure

Hi Anonymous  - Add a debug measure to check TopEventYear and SelectedYear separately to confirm they are correctly calculated.

DebugMeasure =
VAR SelectedYear = SELECTEDVALUE('Calendar'[Date].[Year])
VAR TopEventDate =
CALCULATE(
MAX(CecCaseEvent[EventDate]),
CecCaseEvent[FromStateOfProceedingID] = 4
)
VAR TopEventYear = YEAR(TopEventDate)
RETURN
"Selected Year: " & SELECTEDVALUE('Calendar'[Date].[Year]) &
" | Top Event Year: " & IF(ISBLANK(TopEventYear), "Blank", FORMAT(TopEventYear, "0")) &
" | Difference: " & IF(ISBLANK(TopEventYear), "N/A", FORMAT(SelectedYear - TopEventYear, "0"))

Modify your measure to handle cases where TopEventYear is blank.

pokus6 =
VAR SelectedYear = SELECTEDVALUE('Calendar'[Date].[Year])
VAR TopEventDate =
CALCULATE(
MAX(CecCaseEvent[EventDate]),
CecCaseEvent[FromStateOfProceedingID] = 4
)
VAR TopEventYear = YEAR(TopEventDate)
VAR YearDifference = IF(ISBLANK(TopEventYear), 0, SelectedYear - TopEventYear)
RETURN
COUNTROWS(
FILTER(
CecCaseDetail,
VAR TopFromStateID =
CALCULATE(
SELECTEDVALUE(CecCaseEvent[FromStateOfProceedingID]),
TOPN(
1,
FILTER(
ALL(CecCaseEvent),
CecCaseEvent[CecCaseID] = CecCaseDetail[CecCaseId] &&
CecCaseEvent[ToStateOfProceedingID] <> CecCaseEvent[FromStateOfProceedingID] &&
YEAR(CecCaseEvent[EventDate]) = SelectedYear
),
CecCaseEvent[EventOrder],
DESC
)
)
RETURN
TopFromStateID IN {4} &&
NOT(ISBLANK(TopEventYear)) &&
YearDifference > 5 &&
CALCULATE(
COUNT(CecCaseDetail[CecCaseId]),
CecCaseEvent[EventID] = 64,
YEAR(CecCaseEvent[EventDate]) = SelectedYear,
CecCaseEvent[CecCaseId] = CecCaseEvent[CecCaseId]
) &&
COUNTROWS(
FILTER(
'CecLeadingCase',
'CecLeadingCase'[CecCaseId] = CecCaseDetail[CecCaseId]
)
)
)
)

Instead of checking if the difference is greater than 5 years, check if it's greater than 60 months.

Replace (SelectedYear - TopEventYear) > 5 with MonthDifference > 60. check this.