case statement not following desire logic correctly

I am trying to input the pseudo-code below into a sql case statement

but i think is not working because the 3rd scenario is not applying when appropriate.

pseudo code:
A. If “Requested Price” have value then calculate “Requested Price” minus “Total Cost” divided “Requested Price” equal “Expected Margin”
B. If “Suggested Price” have value then calculate “Suggested Price” minus “Total Cost” divided “Suggested Price” equal “Expected Margin”
C. If “Requested Price” and “Suggested Price” both have values then calculate “Suggested Price” minus “Total Cost” divided “Suggested Price” equal “Expected Margin”

,	ExpectedMargin = CASE 
						WHEN [sql].[SalesQuotePriceRequested] <> 0 
						THEN (
								[sql].[SalesQuotePriceRequested]			
								- (										
									ROUND([sql].UnitCostMaterial,2)
									+ROUND([sql].[TotalLabor_OHCost], 2)
									+ROUND([sql].[UnitCostFreight], 2)
									+[sql].[UnitCostSGA]	
									+ROUND([sql].[UnitCostDiscount], 2)
									+[sql].[AdditionalCost]
								  )										
							 ) / [sql].[SalesQuotePriceRequested]
						WHEN [sql].[SuggestedPrice] <> 0
						THEN (
								[sql].[SuggestedPrice]					
								- (										
									ROUND([sql].UnitCostMaterial,2)
									+ROUND([sql].[TotalLabor_OHCost], 2)
									+ROUND([sql].[UnitCostFreight], 2)
									+[sql].[UnitCostSGA]	
									+ROUND([sql].[UnitCostDiscount], 2)
									+[sql].[AdditionalCost]
								  )										
							 ) / [sql].[SuggestedPrice] 
						WHEN ([sql].[SalesQuotePriceRequested] <> 0 AND [sql].[SuggestedPrice] <> 0)
						THEN (
								[sql].[SuggestedPrice]					
								- (										
									ROUND([sql].UnitCostMaterial,2)
									+ROUND([sql].[TotalLabor_OHCost], 2)
									+ROUND([sql].[UnitCostFreight], 2)
									+[sql].[UnitCostSGA]	
									+ROUND([sql].[UnitCostDiscount], 2)
									+[sql].[AdditionalCost]
								  )										
							 ) / [sql].[SuggestedPrice] 
				     END

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