ExecuteCustomCalculateBusinessRule ... but in workspaces

Hi Sergey, 

I hit the same issue recently and wanted to reply with the solution in case it helps others in the future. Apologies if I am reviving an old thread. 

The "brName" parameter seems to need to adhere to the same syntax as when calling a custom calculate from within the workspace itself.  E.g.

When the service factory is assigned to the maintenance unit, this would be :

Workspace.{WorkspaceName}.{MaintenanceUnitName}.WSMU

I found this out mainly through trial and error. I have included the "Finance Custom Calculate Service" I quickly wrote to figure it out below, in case it helps others troubleshoot. 

	Public Class WsasFinanceCustomCalculate
		Implements IWsasFinanceCustomCalculateV800

        Public Sub CustomCalculate(
			ByVal si As SessionInfo, 
			ByVal brGlobals As BRGlobals, 
			ByVal api As FinanceRulesApi, 
			ByVal args As FinanceRulesArgs
		) Implements IWsasFinanceCustomCalculateV800.CustomCalculate
            Try
				Dim skipCalcForPov As Boolean = (
					api.Entity.HasChildren() OrElse
					api.Cons.IsForeignCurrencyForEntity()
				)
				If skipCalcForPov Then Exit Sub
				
				Dim functionName As String = args.CustomCalculateArgs.FunctionName
				Select Case functionName
					
					' Parent custom calc
					Case "InitialCustomCalc": 
						api.LogMessage("'InitialCustomCalc' run successfully from service factory.")
						
						Dim workspaceName As String = "TestNestedCustomCalc"
						Dim maintenanceUnitName As String = "TestNestedCustomCalc"
						
						Dim workspaceID As Guid = BRApi.Dashboards.Workspaces.GetWorkspaceIDFromName(si, False, workspaceName)
						
						' Trying different brNames
						Dim brNameOptions As New List(Of String) 
						With brNameOptions
							.Add("Assembly")
							.Add("WsAssemblyFactory")
							.Add("InitialCustomCalc")
							.Add($"Workspace.{workspaceName}.{maintenanceUnitName}.WSMU") ' This one works
							.Add($"{workspaceName}")
						End With
						
						For Each brName As String In brNameOptions
						
							Dim brParamDict As New Dictionary (Of String, String) From {
								{"Cube", api.Pov.Cube.Name},
								{"Entity", api.Pov.Entity.Name},
								{"Consolidation", api.Pov.Cons.Name},
								{"Scenario", api.Pov.Scenario.Name},
								{"Time", api.Pov.Time.Name},
								{"View", api.Pov.View.Name},
								{"brName", brName}
							}
							
							BRApi.Finance.Calculate.ExecuteCustomCalculateBusinessRule(si, workspaceId, brName, "BaseEntityCustomCalc", brParamDict, CustomCalculateTimeType.CurrentPeriod)
						
						Next brName
					
					Case "BaseEntityCustomCalc":
						Dim brName As String = args.CustomCalculateArgs.NameValuePairs.XFGetValue("brName","")
						api.LogMessage($"'BaseEntityCustomCalc' run successfully from within 'InitialCustomCalc' using brName '{brName}'.")
					
					Case Else:
						Throw New NotImplementedException($"Function name '{functionName}' not implemented in workspace assembly.")
						
				End Select
				
            Catch ex As Exception
                Throw New XFException(si, ex)
            End Try
        End Sub

Thanks,

Stuart