The issue is occurring because of the ProductRatePlanCharge.zqu__Type__c value on some of the ProductRatePlanCharges. As of Quotes 9.3, we no longer support the 'OneTime' value on ProductRatePlanCharge object. Only the values, 'One-Time', 'Recurring', and 'Usage' are supported (note that One-Time is supported while OneTime is not).
Please run the below query to find the value of this field on the Product rate plan charge object :
select id,name,zqu__Type__c, zqu__EndDateCondition__c,zqu__ZuoraId__c,zqu__productRatePlan__r.zqu__product__c, zqu__Model__c,createdDate,lastmodifiedDate, zqu__SyncStatus__c from zqu__productRatePlanCharge__c where zqu__productRatePlan__r.zqu__product__c = 'Product SFDC ID'
You will see that some of the Charges have the value, 'OneTime' on the zqu__Type__c field. As a workaround, please update the zqu__Type__c value on these charges from 'OneTime' to 'One-Time'.
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