Vertical P&L Special Calculations

Hello Everyone, 

I hope someone can help me with this DAX or logic...I am trying to build a P&L report in Matix with 4 P&L levels in rows.  Some of the P&L components are not simply the sum of the sub-group in the lower level. 

For example:

Trade Spend = "Invoice Disc" + "Non-Inv Dis" (excluding "Inv Sales - Ext")
NSV - Ext = "Inv Sales - Ext" - "Non-Inv Dis"

Those P&L components are not from GL transactions.

So, I have built a dynamic P&L measure, aiming to redirect the returning value to their specific measures. 

Dynamic P&L Measure Testing =
VAR IsLevel1 = ISINSCOPE('MappingTable'[P&L Level 1])
VAR IsLevel2 = ISINSCOPE('MappingTable'[P&L Level 2])
VAR Level1Value = SELECTEDVALUE('MappingTable'[P&L Level 1], "Other")
VAR Level2Value = SELECTEDVALUE('MappingTable'[P&L Level 2], "Other")

RETURN
SWITCH (
TRUE(),
IsLevel2 && Level2Value <> "Other", SWITCH(
Level2Value,
"Inv Sales - Ext", [Inv Sales - Ext Actuals],
"NSV - Ext", [NSV - Ext],
[Actuals]
),
IsLevel1 && Level1Value <> "Other", SWITCH(
Level1Value,
"Trade Spend", [Trade Spend],
"NSV", [NSV],
[Actuals]
),
[Actuals]
)

I don't think my logic is correct. The Inv Sales - Ext Actuals measure return the correct amount in a Card, but in my Matrix with 4 levels, it only shows the amount of InvoiceDisc.....

Also I have another concern that the special calculation P&L components at the bottom of the report refer to the other measures from the top of the P&L. Those self-reference measures may not work....any thought?

Appreciate any comment and advice. Cheers!

Sam