Action name: OpDecimalThis command converts the immediate operand(s) type of the current instruction/data to decimal. Therefore, it becomes a 'number'.
When you use this command, IDA deletes the manually entered operand.
If the cursor is on the first operand (the cursor is before ',') then the first operand will be affected; otherwise, all other operands will be affected.
See also Edit|Operand types|Number submenu.