i2, which makes supply chain management software (SCM), claims that SAP has infringed seven patents granted between 1998 and 2006.

The alleged patent infringements, listed in the lawsuit i2 filed in the District Court for the Eastern District of Texas, US relate to SCM models and tools in areas such as managing factory planning systems, negotiating and tracking the sale of goods and allocating manufactured product to sellers.

"We are currently looking into this," said SAP spokesman Frank Hartmann. "That's all we can say at the moment."

In a statement, i2 said the lawsuit against SAP is "critical" for the US SCM vendor to protect its patented innovations.