I don't see anything related to Post to WIP in the logs either.
In an earlier version if I put trace on I get
StartAction: postToWIPPreview Date: Tue Oct 10 10:57:37 EEST 2017 UserName: kinnunenad SessionId: 5007372__FF187BE2-4C66-4683-B35B-425F1F1A17A3
PMD:STATEMENT-SET: revmgr.modified.getPostToWIPPreview in persistProcessingMetaData.xml
NDE:CONN@1ebcd54: class: org.logicalcobwebs.cglib.proxy.Proxy$ProxyImpl$$EnhancerByCGLIB$$2835482b
auto-commit: true
NDE:CONN@1ebcd54: transaction isolation level: TRANSACTION_READ_UNCOMMITTED
PMD:STATEMENT: revmgr.modified.getPostToWIPPreviewDetails in persistProcessingMetaData.xml at Tue Oct 10 10:57:37 EEST 2017
NDE:CSTM@de6cfc: Non-SQL Time: 0
{call PAC_PRC_POSTTOWIP_PV_SP (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?,?)}
and the parameters I used.
But the trace has to be on when I post to get that.