**BUG** Concise problem statement: A SIN source has a phase angle attribute for the transient usage and a phase angle attribute for the AC analysis usage. A full text definition is like this: .ac phase................| SIN(0 1 1k 0 0 90) AC 1 0 .tran phase.....| In Properties > Part Attributes Custom Attributes i) there is no attribute for the .tran phase ii) the attribute for the .ac phase is left blank. It might be better to show a default of 0 Url: https://easyeda.com/file_view_Use-SIN-source-to-generate-COS_808qkCvN5.htm Browser:Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/30.0.1599.114 Chrome/30.0.1599.114 Safari/537.36