Google Analytics not displaying Category - google-analytics

Question

After much pain and weeping and gnashing of teeth, I finally managed to get my website to talk to GTM and GTM to send data to Analytics.
I can see revenue and conversion rates and transaction results in Analytics, but not the product category.
I have my GTM tag set to use the Transaction track type along with the data layer.
My test code is:
dataLayer.push({
'transactionId': 'OnClickTransactionDataLayerPushID', // Transaction ID - Type:String - Required
'transactionAffiliation': 'OnClickTransactionDataLayerPushAffiliation', // store name - Type:String - Optional to use
'transactionTotal': 45, //total revenue - Type:Numeric - Required
'transactionTax': 5, // Tax amount for transaction - Type:Numeric - Optional to use
'transactionShipping': 5, // Shipping cost - Type:Numeric - Optional to use
'transactionProducts': [{
'sku': 'SKU456789', // Product SKU - Type:String - Required
'name': 'OnClickTransactionDataLayerPushName', // Product Name - Type:String - Required
'category': 'OnClickTransactionDataLayerPushNameCategory', // Product Category - Type:String - Optional to use
'price': 35, // Product Price - Type:Numeric - Required
'quantity': 1 // Product Quantity - Type:Numeric - Required
}]
});
In the GA Debugger I can see that the category is being sent as: ec:item variation (&iv) OnClickTransactionDataLayerPushNameCategory
The only problem is that this isn't a true variation. A variation would be something like color or size, not whether an item belongs to a t-shirt category or whatever. In any event, if this information is being sent over, why can't I see it in Analytics?
EDIT
After trying the Enhanced ECommerce code again as below, I see that the product names are hitting the top products list, but no monetary amounts or quantities are displayed. I can see that being sent in the GA debugger though?
dataLayer.push({
"event": "addToCart",
"ecommerce": {
"currencyCode": "USD",
"add": {
"products": [{
"id": "b55da",
"name": "Flexigen T-Shirt",
"price": "16.00",
"brand": "Flexigen",
"category": "T-Shirts",
"variant": "red",
"dimension1": "M",
"position": 0,
"quantity": 1
}]
}
}
});

Answer 1

Your code is standard e-commerce and the report says enhance e-commerce.
Standard
https://support.google.com/tagmanager/answer/6107169?hl=en
Enhance
https://developers.google.com/tag-manager/enhanced-ecommerce
Disable the enhance e-commerce in you view configuration, tab e-commerce and try to look again.