From the Main Menu, select "\Tools\Material Database Editor".
SA-213-T91 is not in the database, therefore you have to add this as a new material. The first entry should be for "All Codes", with all information EXCEPT for allowable stresses. Then, change the piping code entry to the particular Code your interested in, define the allowable stresses and save this 2nd entry.
_________________________
Regards,
Richard Ay - Consultant