Is a negative slope permitted in a plastic MISO curve (TB,MISO)? It seems to be allowed in ANSYS 11.0.

This was unintended. A negative slope is error trapped in 12.0 (defect 72633).

The documentation below clearly states that it isn't supported.

> Nonliner Stress -Strain Materials
> Multilinear Isotropic Hardening
...No segment can have a slope less than zero.

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