When an ERP project overruns its budget or timeline, the software is rarely the cause. Usually the business stopped owning the design, the data or the testing, and the system went live without them.
Below are five mistakes that recur in manufacturing and trading implementations, and what the finance lead can do about each.
What are the five most common ERP implementation mistakes?
1. Treating ERP as an IT project
ERP changes how costs are captured, how stock is valued and how margins are reported. If business owners leave the design to the implementation partner, the system goes live but decisions do not improve.
Prevention: name a business owner for each process, write down which decisions the system must support, such as cash visibility, stock turns and margin by product, and keep a steering committee at management level until after the first year-end.
2. Choosing the partner on price
The configuration team shapes the outcome. A low bid with a changing team usually costs more by go-live.
Prevention: ask for references in your industry, the named consultants and their availability, and how change requests are priced.
3. Rushing master data
The chart of accounts, items, bills of materials, customers and suppliers are often designed in the last weeks. Poor structures then limit reporting for years.
Prevention: approve the chart of accounts and costing structure before configuration, and give data cleansing its own owner and deadline.
4. Testing only the standard flows
Teams test a normal sale and a normal purchase, and miss returns, credit notes, partial deliveries, inter-company charges and tax exceptions. From 2027, UAE e-invoicing adds structured invoice data and rejected invoices to the list for in-scope businesses.
Prevention: build test scripts from last year's real transactions, including the exceptions, and require finance sign-off on a full month-end close in the test system.
5. Going live without a support plan
The first closes after go-live show the gaps. Without a plan, staff fall back to spreadsheets.
Prevention: agree a support period after go-live, a daily issue list and a fixed date for the first full management report from the new system.
What should the finance lead own?
- The business case and the decisions the system must support.
- The chart of accounts, costing logic and reporting design.
- Sign-off on data cleansing.
- Sign-off on testing, including a full month-end close.
- The first three closes after go-live.
Written by Muhammad Imran, ACMA, drawing on finance roles in manufacturing in the UAE and Pakistan, including Oracle ERP reporting.