Return a different Column Set Based on Point of View

Thanks very much! I did get a hint from the services team - regarding the parameter, in that I needed to pass the XFBR string into the row/column sharing via a literal value parameter rather than just putting the xfbr string into the row/column sharing option.

You can pass the PovTime in the string format below...|PovTime|...Then derive the integer value of the time member id (yours might be different depending on your time dimension is setup) to return the appropriate column set in the formula below.

Here is my version below :)

#Region "External Flash Column Set"

'XFBR(JLL_ParamHelper_Mgmt_Book_Col_Set, FLASH_COL_SET, PovTime=[|PovTime|])

' FLASH_COL_SET is function
' PovTime is variable external
' PovTimeName is internal variable
If args.FunctionName.XFEqualsIgnoreCase("FLASH_COL_SET") Then 

'In the Rule "PovTime" = |PovTime| - reference to the string in parameter 
Dim PovTimeName As String = args.NameValuePairs.XFGetValue("PovTime")

'Get the Member ID of Time member. Member ID is numeric for example 2019M9 = 2019014000
Dim PovTime As Integer = BRApi.Finance.Members.GetMemberId(si, dimTypeId.Time, PovTimeName)

'Write message to OneStream Error Log
'Dim yourValue As String = PovTime '<-- Enter message to write to log
'BRApi.ErrorLog.LogMessage(si, yourValue)

'Set the MemberID to string to manipulate
Dim POVTimeFullString As String = PovTime

'Manipulate the Member ID to get the last six digits of Time Member ID, so you can ignore the year
Dim numChars As Integer = 6
Dim PovMonth As String = ""
PovMonth = POVTimeFullString.Substring(POVTimeFullString.Length - numChars) 

'Dim yourValue2 As String = PovMonth '<-- Enter message to write to log
'BRApi.ErrorLog.LogMessage(si, yourValue2)

'Use the time member ID's to return a column set in place of the paramter

Select Case PovMonth 

'Q1 Periods
Case "002000","003000","004000","005000"
Return "EXT_FLASH_Q1_COL_SET"
'Q2 Periods

Case "001000","006000","007000","008000","009000"
Return "EXT_FLASH_Q2_COL_SET"
'Q3 Periods

Case "011000","012000","013000","014000" 
Return "EXT_FLASH_Q3_COL_SET"
'Q4 Periods 
Case "000000","015000","016000","017000","018000"
Return "EXT_FLASH_Q4_COL_SET"

End Select

End If
#End Region