Deadline and Postpone properties for BulkAddQueueItems-Activity

Hi all,
we’re developing a dispatcher that needs to process a lot of data, and accordingly, we’re using the BulkAddQueueItems activity to process the transactions into the Orchestrator Queue. Unfortunately, this activity does not have the “Deadline” property that we need. We have already tried to add the column “Deadline” in the Input DataTable (all possible ways to write it; as described here) and format the date – nothing worked so far. Does anyone of you know this problem and has a solution for it? Thanks in advance!