Recently I came across this article 
<a href='http://www.eadocsoftware.com/pdf/63_MLM_How-Can-the-Contractor-Participate-in-the-Owner-CMs-Environment.pdf'>"How Can the Contractor Participate in the Owner or CMs Environment"</a> talking about work arounds for using Primavera Contract Manager as a collaborative project management application. Essentially this article concludes that Owners and CM's will need to buy or develop their own application for allowing contractors to submit information directly into Contract Manager or pay staff to manually enter the data.  Choosing EADOC you will save 1-2 FTE on a project  or $250-$2M on custom software development compared to Primavera contract manager based on the options presented in the article. 

<strong>Option A from the article </strong>
"The  Contractor uses same  Contract Management  system as owner. This can be problematic to execute, even when the requirements are clearly spelled out in the contract by the Owner or CM. Contractors and architects will resist using the owner (or CM’s) system to manage the process of creating or reviewing documents. Most will keep this process internal and only enter the final "official document" in the owners system.  Contractors  and architects require full “read/write” access to the owners Contract Management environment in order to  originate  any document  or attach any backup documentation. If  a  document (RFI, Submittal) is managed inside a contractors specific project in Contract Management (as opposed to being manually re-entered in the Construction Manager's project  by the Owner), <strong>all review comments can be seen by the contractor,</strong>  in addition to the official response. These  two issues (“read/write”  access and the contractor being able to see reviewer’s comments) are often fatal flaws when deploying Contract Management as a project team database.  While  Option A  is a common approach,  our experience is this option does not work well. "

<strong>Option B from the article</strong> (zero cost savings over an excel spreadsheet since the CM or Owner has to enter all data into Contract Manager)
"The contractor submits an electronic copy of their document.  <strong>The Construction Manager’s staff logs  the document into their  Contract  Management  database  system, routing the document for review and recording  each reviewer’s  comments.</strong> The  advantage to  this approach  is,  the contractor may continue to use whatever system they currently use (you'd be surprised how many do not have a standard system), to create RFI’s, proposal, submittals (85% of all documents submitted) into a printed  PDF electronic document  (documents cannot be scanned to PDF  - scans are not searchable). The printed document is emailed to the Construction Manager by the contractor.  The  contractor is never given access to  the Owners  Contract Management  System. This prevents the contractor from seeing others comments, which is often an important issue for the owners team. "
 
EADOC is the only true collaborative project management application that allows for the complete control of information as it works it's way across your project team resulting tremendous cost savings.