Two planning engines were built on ERPNext, together with Theory of Constraints (TOC) consultants Yagna.

• Project planning engine: uses critical path to set start and end dates from task dependencies, and critical chain to add resource constraints. Buffers are held at project level instead of padding every task.
• Gantt and fever charts: Gantt charts show the critical and feeding paths, and fever charts show buffer consumption along the critical chain, so management can see which projects are at risk.
• TOC-based MRP: demand is driven by actual orders. Buffer and minimum stock are set per item, and buffer items are made in advance and drawn when needed.
• Automatic replenishment: Top of Green, Yellow and Red levels per item trigger Material Requests automatically.
• Priority-based material planning: the BOM is exploded and a Required By date is set on each Material Request from lead times. For items without buffers, the MRP run can be triggered from Sales Orders in order of priority.
• 20+ custom reports: including MTO shortage, Sales Order and Work Order full-kit status, colour-coded material status (red, black, white, yellow, green) and buffer-wise logs.