New material with custom properties cannot be added in the STAAD.Pro Physical Modeler
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Steps to Reproduce
Within SPPM, go to the ribbon menu option Model and click on Model Catalog.
Click on Add Material to create a new material.
Note that whenever any of the values like E, G etc. are edited the cells turn red.
Click on Ok and the following error message comes up
Click on OK.
The modified cells get highlighted in red and when any of those cells are clicked, errors pop up as shown below
Same thing happens with material Type set to Custom or Generic
The only way for now is to drop the physical model and continue with the analytical model which would allow defining a custom material.
Solution
The problem will be addressed in the upcoming release of STAAD.Pro Connect Edition Update 4.