In the internet and mobile age, some business has a core system for data &/ transaction processing and a back-end accounting system. In additional, there are likely a few front-end systems for different purposes or requirements.
The various systems will be from different vendors &/ computer platforms. Hence there will be interfaces and integrations implemented to avoid redundancies. At the minimum, there will be GL mappings and integration to the accounting system.
Fundamentally the business requirements will be translated & implemented across the various systems, and Finance has to completely & accurately capture the business transactions.
Issues and functionality gaps often arise from business requirements not properly captured or understood, or lost in translation in IT terms or by the vendor resulting in certain or the overall system not meeting requirements.
Ideally there should be a Solutions Architect that has the commercial, business and Finance knowledge and experience, in addition to IT technical skills and knowledge to be able to effectively translate real requirements into IT design and implementation.
Overall, there is a need for cross functional alignment of the end-to-end business data/transaction processing between Business, IT and Finance to ensure data integrity, compliance and governance.