Following the success of MOL Group PI System implementation logical choice was to choose the same approach on both INA Downstream and Upstream. INA Upstream recognizes the importance and potential of implementing PI System to enable digital transformation as a necessary precondition for the Digital oil field concept. Implementation of the Try & Buy PI System took a total of twelve working days, with the benefit of continuing to be used existed PI System ecosystem after acquiring permanent licenses and expanding it to an additional four oil fields in 2020. Aim of PI System in Integrated Production Optimization 4.0 (IPO 4.0) project is to ensure continuous and secure data flow from oil fields to business oriented expert systems for modelling, optimization and diagnostics engine of the production system. IPO 4.0 goal is to decrease time of the reaction to under performing production, enabler for advanced well surveillance and collaborative engineering environment increasing production between 3-5%.