ERP Invoicing & Billing Integration

I want to consolidate the way we book bills and issue invoices by introducing an ERP module focused solely on accounting and finance. Right now most of our numbers sit in Excel and a legacy accounting package; the double-entry work is slowing us down. Your task is to deploy or tailor an ERP solution so that every purchase bill, sales invoice, credit note and payment automatically flows into our existing accounting software without manual re-keying.

Core scope
• Configure the accounting & finance module with clean, user-friendly screens for invoicing and billing.
• Map every relevant field so entries pushed from the ERP land perfectly inside our current ledger structure.
• Build import/export routines (CSV, XLSX or direct API—whatever works best with the present system).
• Migrate a small sample of historical Excel data to prove the process, then outline the steps so my team can repeat it.

Acceptance criteria
– New sales invoices raised in the ERP appear in the legacy system within minutes, balanced and allocated to the right GL codes.
– Bills booked in the ERP replicate the Excel sheets we use today, but post straight through to the supplier ledger.
– A brief hand-off guide and screen-share walkthrough demonstrate the end-to-end flow.

If you have hands-on experience with tools like Odoo, Dolibarr, ERPNext, Zoho Books or similar—especially when you have already wired them into another accounting package—let me know. Strong SQL-ETL or API scripting skills will help, but whatever stack you favour, reliability and clarity in the financial postings is what matters most.