QB Issue Resolution:

“What would be the easiest way to apply all the credits to one check to the travel agent?  The travel company only wants one check.”

You Break down and allocate your entries on the check, in the bottom part on the Items tab using your two sided Travel item. This is Splits. The travel agent gets one check; you have Details.

List each student amount and as Billable to them.

Then, you can Invoice them, using the Add Time & Costs function, and that is an invoice to which their credit gets applied.

Resolution for Issue 'credits in students account to be used for a trip' available: Yes (Solved).
Source: Intuit Community forum.

credits in students account to be used for a trip: 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.

Support for Costs function
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Error Recovery for Costs function [Canada]
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