ReleaseAllocByType as VOUCHER XML tag is not appearing when voucher is issued

Summary:

We have created shipment group for secondary charge shipments, then invoice and voucher is also issued.

In that voucher outbound XML, we are unable to find ReleaseAllocByType tag for Voucher, its having only for planning.

Any idea on this? Here, related transport shipment is not processed for invoicing and voucher.

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