Every time customer data moves between systems—CRM to invoicing, invoicing to accounting, accounting to analytics—something breaks. Not always. Just often enough that nobody notices until reconciliation fails, a quote gets invoiced twice, or a contact vanishes halfway through the pipeline. The problem isn't that these handoffs are hard to build. It's that most businesses build them in isolation, then stack new integrations on top without auditing the originals. After eighteen months, you're managing data flow across seven systems with no single owner. When something breaks, the blame bounces between departments. Here are the nine handoff points where customer context typically leaks, and how to audit each one in under two hours. 1. Lead capture to CRM pipeline Your website form, email signup, or API call lands a new lead. It hits your CRM with a name, email, and company. By the time a sales rep opens the record, two fields are missing or corrupted. Where it breaks: Form capture tools (Typeform, Gravity Forms, custom webhooks) send nested JSON; your CRM flattens it into three columns and drops the rest. Phone numbers arrive in ten formats; your CRM expects one. No normalization, no fallback. Company name comes from multiple sources (website domain, user input, reverse IP lookup); you store only the first, creating duplicates. UTM parameters, referral source, or lead scoring data never get mapped to custom fields, so they vanish on import. Audit in 15 minutes: Pull your last 100 leads. Count how many are missing a phone number, have a truncated company name, or show "unknown" for lead source. If it's more than 5%, you have a mapper problem. Check your form-to-CRM integration logs (most tools show success even when fields are dropped). 2. CRM deal stage to invoicing trigger A deal closes in your CRM. An invoice should generate automatically. Instead, the sales rep manually creates a quote in a separate tool, emails it, then manually creates the invoice after signature. The deal record never sees the quote or invoice. Where it breaks: No automation rule connects deal closure to invoice creation; it relies on manual workflow. Custom fields in your CRM (billing email, payment terms, tax ID) don't map to invoice fields; the invoice team re-enters data by hand. Invoice line items come from a separate product catalog, not deal line items; quantities or pricing diverge. Deal currency differs from invoice currency (multi-currency deals); no conversion rule exists, and the invoice goes out in the wrong currency. Audit in 20 minutes: Pick your last 10 closed deals. For each one, count the number of times data was re-entered (CRM to quote, quote to invoice, invoice to invoice template). If any deal touched more than two systems, you're leaking context and time. Check whether your invoicing platform can read deal line items directly from your CRM, or if someone is manually copying them. 3. Invoice line items to GL account coding An invoice ships with three line items: "Product A," "Setup," and "Support." Each should map to a different revenue account in your GL. Instead, the accountant coded them all to "4000 – Revenue" and made a manual note to recode one after month-end close. The reconciliation now has an error you won't find until audit. Where it breaks: No mapping rule exists between invoice line-item descriptions and GL accounts; your accountant guesses or defaults to a catch-all. Multiple products map to the same GL account, or one product should split across two accounts (COGS + revenue) and doesn't. Tax lines don't have a dedicated GL account; they either vanish or land in revenue. Multi-currency invoices don't split realized and unrealized FX variance into separate accounts; everything lands in one place. Audit in 25 minutes: Export your last 30 days of invoices and your GL. For each invoice, verify that line items match GL entries. Count discrepancies. If more than 2–3 invoices required manual GL coding, you need a rules engine. Most accounting platforms support line-item-to-GL mappings; yours either isn't configured or doesn't have the feature. 4. GL reconciliation to bank and credit card feeds Your GL shows ₹50,000 in account "1200 – Accounts Receivable." Your bank shows ₹47,500 received. The reconciliation report flags ₹2,500 as "unmatched." It's actually two invoices that came in at different times and were coded to different sub-accounts, neither of which feeds the reconciliation logic. Where it breaks: GL sub-accounts exist but aren't linked to the reconciliation feed; transactions post to sub-accounts and vanish from the top-level reconciliation. Invoices are coded to "Deferred Revenue" or a liability account pending milestone completion; the reconciliation tool doesn't know to wait. Bank feed shows a single deposit from a payment processor (Stripe, PayPal, Razorpay) with five invoices bundled; your GL code each invoice separately and the feed shows only the bundle total. Multi-currency invoices settle i