QB Issue Resolution:

you have a choice basically

you can receive payment against the 2014 invoices and in the amount paid block enter the full amount of the check, QB will ask if you want to refund or keep as a customer credit, keep it as a credit

or

you can receive payment against the 2014 invoices in the amount of the invoice, then when you make a deposit, on the next line select a customer deposit liability account you create if necessary, and enter the extra amount there

Resolution for Issue 'How do I create an entry for prepaid income. I received a check from a client that covered services delivered in 2014 and a pre-payment on 2015 services.' available: Yes (Solved).
Source: Intuit Community forum.

How do I create an entry for prepaid income. I received a check from a client that covered services delivered in 2014 and a pre-payment on 2015 services.: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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