An item in SAP B1 must have the following UDF fields populated to be displayed on ecom. 

User Defined Fields: 
Ecom item Code - not be blank

Ecom Item Name - not be blank

Generic Item code - not be blank
Available for Sale - Yes
Item Listed on Ecom - Yes
Ecom item Group - not be blank (must have a group selected).

SAP Product General Tab - Must be set to Active other wise we cannot pickup the item data.

To set an item to inactive on ecom:

Leave all other fields populated. 
Available for Sale - No
Item Listed on Ecom - No