How to Solve a Business Central Functionality Gap: A Step by Step Solution Design Framework

Quick answer: When Microsoft Dynamics 365 Business Central doesn’t natively support a client requirement, the right approach is not to start development immediately. It is to run a structured solutioning process first: discuss the requirement in depth, map it end to end, define use cases and edge cases, write a solution design document, keep customizations separate from native Business Central behavior, and get client sign off before writing a single line of code. This reduces rework, controls development cost, and protects future upgrades.

When a Business Central implementation hits a functionality gap, the instinct is often to jump straight into building something. A client asks for a feature the system doesn’t support out of the box, and the pressure to move fast can push teams into development before the actual requirement is fully understood.

That instinct, however well intentioned, is usually where avoidable rework begins.

This article lays out a practical, repeatable framework for solutioning a Business Central functionality gap properly, using a common real world example: a client asking for prepayment functionality in the Project module.

Why a Business Central Functionality Gap Shouldn’t Go Straight to Development

“Prepayment” sounds like a simple, well defined ask. In practice it can mean very different things depending on the business: a percentage of project value versus a fixed amount, a single prepayment versus milestone based prepayments, tied to project budgets or tied to a separate invoicing schedule. If Business Central customization starts on an assumption rather than a confirmed requirement, a mismatch somewhere down the line is almost guaranteed, and fixing it after the fact costs far more than getting it right up front.

Step 1: Discuss the Requirement Thoroughly

Before any solution design work begins, sit down with the client and understand the business need behind the request, not just the surface level ask. Ask open questions about how the process works today, who is involved, and what the desired outcome actually looks like. Good requirements gathering removes ambiguity before it becomes a design decision made on the consultant’s behalf.

Step 2: Map the End to End Requirement

A functionality gap in Business Central is rarely isolated. For a prepayment requirement in the Project module, that means understanding how it connects to project quotations, budgets, milestone billing, work in progress, and final invoicing. Mapping the full lifecycle the request sits in, rather than just the single feature being asked for, prevents design gaps that only surface once development is already underway.

Step 3: Define Concrete Use Cases

Once the requirement is understood end to end, translate it into specific, testable scenarios. How is a prepayment raised. How is it applied against project costs. How is it adjusted or closed out. Each use case should be detailed enough that a tester could walk through it in Business Central step by step without needing further clarification.

Step 4: Build Out the Edge Cases

This is the step that separates a thorough Business Central solution design from a superficial one, and it is the step most often skipped. Edge cases are rarely volunteered by the client because they aren’t thinking about system boundaries, they’re thinking about business as usual. It falls to the consultant to proactively identify scenarios such as partial prepayments, cancellations, multi currency projects, prepayments exceeding project value, or milestones that shift after a prepayment has already been applied.

Step 5: Document a Solution Design

Consolidate the requirement, use cases, and edge cases into a single solution design document. This document becomes the shared reference point between the implementation team and the client, replacing informal or verbal understandings that tend to drift as a project progresses. A well written Business Central solution design should let anyone new to the project understand exactly what is being built and why, without needing additional context.

Step 6: Keep Customizations Away From Native Business Central Behavior

Whatever the final design, the goal should be to extend Business Central, not distort it. Altering core objects or standard processes to force fit a requirement introduces upgrade risk, breaks compatibility with future Business Central releases, and makes the system harder to support for anyone who works on it later. Using the Business Central extension model and configuration options, rather than modifying the base application, keeps the solution upgrade safe and supportable long term.

Step 7: Get Client Sign Off Before Development Begins

Only once the client has reviewed and agreed with the solution design should development start. Sign off at this stage turns the document from a one sided interpretation into a mutual agreement, and it is what protects both the project timeline and the budget once development is underway.

The Payoff of Solutioning a Business Central Functionality Gap the Right Way

Following this sequence is not extra process for its own sake, it is a discipline that pays for itself. Skipping straight to development on an unconfirmed assumption almost always results in rework, and rework is one of the largest hidden costs in ERP implementation projects. A structured approach to solutioning functionality gaps reduces redevelopment cost, keeps delivery timelines predictable, and builds genuine client confidence that their requirement was understood rather than guessed at.

Key Takeaway

The quality of a Business Central solution is decided long before development starts, in how rigorously the functionality gap was solutioned and how carefully the native platform was protected in the process.

How to Solve a Business Central Functionality Gap: A Step by Step Solution Design Framework