ability to dig down and determine what contracts, invoices, receipts or other

backup documentation relate to a given accounting document.

An adequate accounting system should provide easy link-up between

double-entry accounting transactions and the documentation that relates to

the transactions.  For example,

often have a myriad of receipts and invoices associated with them.

[[Handling contractors|UseCases/ContractorsAndContracts]] has similar types

of backup documentation.

Ideally, the system should allow the exploration of and linkage to

documentation in both directions.  It should be trivial to answer questions

such as:

   * I have this receipt/invoice from our document repository.  Which

     accounting transactions relate to this receipt?  Has the transaction

   * Looking at this invoice, can I see the transaction where it was accrued

     and paid?

   * Show me a list of invoices that haven't been paid, with links to those

     invoices.