Broken stock, tills that don't reconcile with your website, labels printed by hand: the hallmarks of a store or chain growing without the right system. We implement the sector-specific ERP that unites POS, warehouse, purchasing, e-commerce and invoicing in a single flow — no duplicated data, no manual day-end close.
Spanish retail has been under double pressure for years: customers compare prices on their phones while standing in the shop, and expect the online stock figure to be accurate. When the ERP is not designed for retail, the outcome is predictable — undetected stockouts, returns that never update the warehouse, and accounting that always arrives late. According to the GS1 Spain 'Retail Insights 2025' report, inventory desynchronisation between the physical and digital channels is the number-one problem cited by retail SMEs. This is not a people problem: it is a systems architecture problem.
At Summum Sistemas we have been accompanying SMEs and mid-market companies through management software implementations since 2007. In retail we work with solutions such as Sage 200, Microsoft Dynamics 365 Business Central and Odoo, choosing the platform based on the number of SKUs, the number of tills and the need to integrate with a marketplace or online store. What never changes is the method: prior diagnosis of the operational flow, sector-specific parametric configuration and real training for the shop team — not a PDF manual no one reads. The go-live includes the initial load of items, suppliers and price lists, and we are on-site for the first live day-end close.
The Verifactu obligation (Royal Decree 1007/2023) also applies to retailers issuing simplified invoices: with effect from 1 January 2027 for companies subject to Corporate Income Tax and 1 July 2027 for other obligated parties (self-employed and individuals under personal income tax), the till or POS system must generate verifiable invoicing records submitted to the Spanish Tax Agency (AEAT). The ERPs we implement already include Verifactu-certified modules or modules in the process of certification, so retailers do not have to change software at the most delicate point in their trading season.
Over one or two days we map the real flow: how goods arrive, how they move between warehouse and shop floor, how the till works, what is already connected to the website. We identify bottlenecks and define the exact scope of the implementation.
We recommend the most suitable platform (Sage 200, Business Central or Odoo) based on volume, budget and integration requirements. We configure product families, channel price lists, cost centres per point of sale, and the POS module with its payment methods and day-end close routines.
We connect the ERP to the online store or marketplace where applicable, configure the EDI connector for suppliers that support it, and execute a clean initial load of items, stock, customers and suppliers — with cross-validation before going live.
We accompany the go-live in store: first tills, first replenishment order, first accounting close. During the following four weeks we resolve real-world usage incidents. At the end of that period the team operates the new system independently.
The operational detail: what we deliver as part of the work and what we keep alive afterwards.
POS integrated with ERP
The point of sale decrements stock in real time, synchronises with the product record and closes against the accounts with no manual intermediate step.
Multi-site stock management
Unified inventory visibility across all points of sale and the central warehouse. Minimum-level alerts, automatic replenishment proposals and inter-store movement traceability.
E-commerce integration
Bidirectional synchronisation of stock, prices and orders between the ERP and the online store (WooCommerce, PrestaShop, Shopify or proprietary platform). Online stock always reflects the actual warehouse position.
Purchasing and suppliers
Purchase orders raised directly from the ERP, goods receipt matched against the supplier delivery note, and reconciliation with the invoice. EDI support for suppliers that issue in that format.
Verifactu and electronic invoicing
Configuration of the Verifactu module in the ERP to comply with Royal Decree 1007/2023: generation of verifiable invoicing records and submission to the AEAT within the required deadlines.
Training and support
On-site or remote training for the shop and administration team. Technical support during stabilisation and access to our ongoing support service after go-live.
A well-implemented retail ERP is the foundation on which Summum IA can add demand forecasting and intelligent replenishment, and on which Summum Consultoría covers labour and tax compliance for commerce.
When the online channel already exists and needs to be connected to the ERP without disrupting sales: bespoke integrations between e-commerce platforms and the management system.
View service → iaWith the ERP's sales history as a foundation, Summum IA applies predictive models to anticipate demand by SKU and season, reducing both overstock and stockouts.
View service → sistemasSpecific Verifactu and B2B electronic invoicing adaptation for retailers issuing high volumes of simplified invoices or selling to other businesses.
View service →A POS manages the till: it sells, takes payment and closes the day. A retail ERP integrates that POS with the warehouse, supplier purchasing, accounting and the online channel. Without that integration, POS stock and warehouse stock diverge, and accounting always arrives late. The ERP eliminates that friction: every sale at the till updates the inventory and generates the accounting entry without manual intervention.
It depends on your current POS and whether it has an API or connector for the chosen ERP. In the initial diagnosis we evaluate whether integrating the existing POS is feasible or whether switching is more cost-effective. Many medium-sized chains end up consolidating on the ERP's native POS to simplify support.
For a single store or a chain of 2–5 points of sale, the typical timeline runs from 6 to 14 weeks from diagnosis to production go-live. The timeframe varies depending on the number of SKUs, integration complexity and the client team's availability for data-load and training sessions.
The platforms we work with (Sage 200, Microsoft Dynamics 365 Business Central, Odoo) include Verifactu-certified modules or modules in the process of certification in line with Royal Decree 1007/2023. During implementation we configure and verify that module so that records are generated and transmitted correctly to the AEAT.
Yes. The 'Process management' category of the Digital Kit programme finances ERP implementations for SMEs. Summum Consultoría can guide you through the grant application and the justification process. Talk to us before applying to make sure the scope aligns with what the programme funds.