I have a fact table with the following columns: product line, end of month inventory count, and month number, and I also have a date table linked to this table by month number. Note that the fact table does not have the full date, only month number. I also have a measure like this:
StartingInventory = IF(SELECTEDVALUE(Table[MonthNumber]) <> 1, CALCULATE(SUMX(Table, Table[Inventory Count]), PREVIOUSMONTH('Date'[Date)), SUMX(Table, Table[Inventory Count]))
When I create a table with product line in the rows, month number in the columns, and StartingInventory in the values, I only get a value for the first month. I'm trying to get the measure to show the previous month's Inventory Count. Do I need to include some other function to use the PREVIOUSMONTH function since my fact table doesn't include a full date? Alernatively, I tried using this function to accomplish the same thing:
TryStartingInventory = CALCULATE(SUMX(Table, Table[Inventory Count], Table[Month Number] - 1)
and this gave me the same values as Inventory Count for each month (i.e., the offset didn't work). Thanks in advance for any help.