T-SQL: AGGREGATE AND/OR CONDITIONAL SUBQUERY ON WHERE CLAUSE - sql-server

Question

Thanks in advance for your help on this. Here's the the scenario. I have two tables: Lots (stores lot info for food items) and Trans (stores inventory transactions on lot items).
I am trying to write a query that lists all the transactions that are older than 90 days based 3 conditions on the where clause somehow:
CurrentQty (on Lots table) > 0
If TransactionType = Shipment AND TransactionDate > 90 days (from current date) OR..
IF TransactionType = Receipt AND TransactionDate > 90 days (from current date)
Notes: for each lot, there could be many different transactions of the same type, as shown in the attached picture. There could be many shipments or receipts. I need to be able to select the MAX(TransactionDate) for a particular transaction type and check to see if it's over 90 days then show the record.
There will always be at least one of these two transaction types on the transaction table for every lot, either Shipment or Receipt. If there is no shipment transaction type on a particular lot, then I want to use the Max(TransactionDate) > 90 condition for the "receipt" transaction type.
I need to be able to evaluate all these conditions for each lot and it's particular transactions.
Below is the query I started to write, but then got stuck on how to structure the rest.
SELECT
LOTS.LOTNUMBER, TRANS.ITEMNUMBER, TRANS.DESCRIPTION,
TRANS.TRANSACTIONTYPE, TRANS.TRANSACTIONDATE, TRANS.WAREHOUSE,
TRANS.QUANTITY
FROM
LOTS
INNER JOIN
TRANS ON LOTS.LOTNUMBER = TRANS.LOTNUMBER
WHERE
LOTS.CURRENTQUANTITY > 0

Answer 1

SELECT
LOTS.LOTNUMBER, TRANS.ITEMNUMBER, TRANS.DESCRIPTION,
TRANS.TRANSACTIONTYPE, TRANS.TRANSACTIONDATE, TRANS.WAREHOUSE,
TRANS.QUANTITY
FROM
LOTS
INNER JOIN
(Select LotNumber, Max(TransactionDate) MaxTransDate From TRANS Group By LotNumber) Trans ON LOTS.LOTNUMBER = TRANS.LOTNUMBER
WHERE
LOTS.CURRENTQUANTITY > 0 And
DATEDIFF(d, TRANS.TRANSACTIONDATE, getdate()) > 90 And
(TRANS.TRANSACTIONTYPE = 'Reciept' Or
TRANS.TRANSACTIONTYPE = 'Shipment')

Answer 2

DECLARE #lots TABLE (
LotNumber NVARCHAR(10)
,ItemNum NVARCHAR(12)
,CurrentQty INT
)
DECLARE #trans TABLE (
TransNum INT
,ItemNum NVARCHAR(12)
,Description NVARCHAR(30)
,TransType NVARCHAR(10)
,TransDate DATE
,Warehouse NVARCHAR(5)
,Quantity INT
)
INSERT INTO #lots VALUES
('ABC','10-MAND-5879',925)
INSERT INTO #trans VALUES
(398741,'10-MAND-5879','10 Lb Mandarin Bag','Receipt','2016-01-01','IXCST',100)
,(973541,'10-MAND-5879','10 Lb Mandarin Bag','Shipment','2016-02-04','WTGS',365)
,(972547,'10-MAND-5879','10 Lb Mandarin Bag','Receipt','2016-02-29','GKWK',250)
,(632403,'10-MAND-5879','10 Lb Mandarin Bag','Shipment','2016-03-01','GWSJ',150)
,(692147,'10-MAND-5879','10 Lb Mandarin Bag','Shipment','2016-03-17','ABTK',25)
;WITH MaxShip
AS (
SELECT ItemNum, TransNum,
ROW_NUMBER () OVER (PARTITION BY ItemNum ORDER BY TransDate DESC) AS TransOrder
FROM #trans
WHERE TransType = 'Shipment'
),
MaxRcpt
AS (
SELECT ItemNum, TransNum,
ROW_NUMBER () OVER (PARTITION BY ItemNum ORDER BY TransDate DESC) AS TransOrder
FROM #trans
WHERE transtype = 'Receipt'
)
SELECT *
FROM #trans t
LEFT JOIN #lots l
ON t.ItemNum = l.ItemNum
JOIN MaxShip ms
ON ms.TransNum = t.TransNum
WHERE TransOrder = 1 AND CurrentQty > 0 AND DATEADD(dd,90,TransDate) < GETDATE()
UNION
SELECT *
FROM #trans t
LEFT JOIN #lots l
ON t.ItemNum = l.ItemNum
JOIN MaxRcpt mr
ON mr.TransNum = t.TransNum
WHERE TransOrder = 1 AND CurrentQty > 0 AND DATEADD(dd,90,TransDate) < GETDATE()