Why not credit all PIs through an expansion of CRISP without linking to dollars?
The Multiple PI initiative includes the capacity to display the names of all involved PIs in NIH’s “Computer Retrieval of Information of Scientific Projects (CRISP)” at http://crisp.cit.nih.gov/. In addition, all PIs are recognized in NIH reports and systems, e.g., in the NIH eRA database, on Summary Statements, and on the Notice of Award. In many cases this will provide appropriate documentation for full crediting. At some institutions, however, there may be a need to document the allocation of funds as well.