When an RGP file is used, CFX parses the file header here: $$$$HEADER $$$R134A The name after the $$$ has be duplicated exactly by the Component Name that is set in the MATERIAL CCL. Both name and case MUST match or CFX will fail with the error. LIBRARY: &replace MATERIAL: r134a Material Group = User Object Origin = User Option = Pure Substance PROPERTIES: Component Name = R134A Option = Table Table Format = TASCflow RGP Table Name = D:/SUPPORT_2018_KEEP/RGP_issue_SR11202184604/Test.rgp END END END