Transfer button is greyed out in an assembly having FOA member.
Solution For alternate assembly the Transfer command is only available when the 'Apply Edits to All Members' option is set. If this option is unchecked then 'Transfer' button is greyed out.
This option is available on Alternate Assembly Pane. When you set the Apply Edits to All Members option on the Alternate Assemblies tab, the modifications you make are globally applied to all members.
Hardware/Software Configuration Platform: INTL64
OS Version: 1064