IPOPT appears to work well to solve the NLP but fails to calculate correct multipliers. Sqpmethod+qrqp is better at calculating the correct multipliers, but can be slow and doesn't have good globalization. As an workaround solution, it would be good to be able to use IPOPT (or some other mature code) as a presolver for Sqpmethod+qrqp.
IPOPT appears to work well to solve the NLP but fails to calculate correct multipliers. Sqpmethod+qrqp is better at calculating the correct multipliers, but can be slow and doesn't have good globalization. As an workaround solution, it would be good to be able to use IPOPT (or some other mature code) as a presolver for Sqpmethod+qrqp.