We were having the same issue. Following is the documentation I received from Epicor support:
GL > setup > GL Transaction type
Search/Select COSandWIP tran type
New > new revision > copy from existing (whichever revision is your current active) The new revision will appear at the bottom of the tree view, and will be in Draft status Revisions > book > detail tab Change summariziation to "Summarize"
Revisions > Revision Detail Tab > choose Active from the Status Dropdown When it finishes, Save
The capture will now post in summarized format, as it did in version 8.x and prior
We are in the process of testing this out in our test environment this afternoon with the hopes of a shorter processing time.
Hope this helps you!