Stable references
Carry document IDs, cost codes, vendor references and posting state into the hand-off.
Tally workflow
CostGrid can control project obligations and evidence while Tally remains the chosen accounting ledger. A future file hand-off must be validated, documented and separately certified; no such Tally workflow is claimed in this release.
Where control breaks
The CostGrid control path
Carry document IDs, cost codes, vendor references and posting state into the hand-off.
A future workflow must move approved records only, use explicit mapping and record an attributable export event.
Do not imply statutory posting, bank reconciliation or live sync until separately certified.
Operational outcome
Start with one live project, keep the control trail intact, and expand only after the workflow proves useful.