Re: Error Scheduling Document with Prompts using REST API - An internal error occurred while calling 'answerPromptsEx' API. (Error: ERR_WIS_30270)

Perhaps the issue comes from the date format.

To quote [SAP BusinessObjects RESTful Web Service SDK User Guide for Web Intelligence and the BI Semantic Layer] documentation, "The RESTful Web Service SDKs support dateTimedata of the following format: yyyy-mm-ddThh:mm:ss(zzzzzz)".