Length of stay attribute can only be set on Rate Plans with LOS enabled.
Explanation and EQC partner Action:
The message included the Rate/@lengthOfStay attribute for a rate plan that is not length of stay pricing enabled. Review your implementation of Expedia QuickConnect and make sure the pricing model you use is in line with what is configured on the HotelExtranet for your property. For assistance, please contact email@example.com for new activations and/or firstname.lastname@example.org for existing connections.