When creating a Return Authorization from a Sales Order, not all Items are carried over. When users encounter this type of problem, check the following:
This type of scenario often happens with Service Items.
a) The user has to consider if it is marked as Can be Fulfilled/Received or not
a.1) If it is marked as Can be Fulfilled/Received, the Service Item should have been included in the Item Fulfillment in order for it to be included in the Return Authorization
a.2) If it is not marked as Can be Fulfilled/Received, the Service Item should have been "Invoiced" in order for it to be included in the Return Authorization
*Note that a Credit Card Payment, as well as a Cash Sale, is considered to be an Invoicing transaction.
* Also, the timing of the transaction is essential; the Service Item should have been "Invoiced" already before creating the Return Authorization.