The columns in the JC-M report are based on the transaction detail you can look at in JC-C, D, E and Q if you want to look at the transactions contributing to the net WIP and see where they may be coming from.

And JC-P will list materials in WIP by part number or Work order.  Are you  looking for a combination of the two reports, JC-C and JC-P? I don't think that exists, but you could probably create it in Access  or maybe Crystal.
We dod check the WIP in GL and the number on the WIP summary and balance them every month.  The numbers for labor and materials on the WIP summary are for items both still in wip and also in finished production.  Only the total on the right is the one you should compare to your WIP in the GL.  If you are trying to get labor and materials totals from the wip summary and have unclosed finished or partially finished work orders, you need to do some math.

I may be in the minority of DBA/EVA users, but every month I analyze WIP by components of labor, material and loads, for which separate GL accounts are maintained.
 
I use JC-P to reconcile WIP material only.
 
I use JC-C for monthly labor hours/$ which I import into an Excel spreadsheet anaylzing each work order and apportion WIP labor costs by percentage complete. (i.e. if a work order was completed/closed during the month all labor costs must be removed from WIP-Labor or if 5/10 units were completed during the month, 50% of labor costs are removed)  I use a beginning balance, add the current month labor, and determine those labor costs that should remain in WIP-Labor.
 
The fixed and variable loads are calculated based on monthend labor hours (determined by monthend WIP-Labor dollars divided by labor rate)
 
WIP Material and labor variations are recorded into one GL account which we call Inventory Shrinkage (RM & FG variations also use this account)