The system stored procedure sp_iqaddlogin is different in IQ 12.7 and IQ 15.1
The main difference ist the syntax and it seems that the 15-version might have a bug.
Neither sp_iqaddlogin, nor sp_iqpassword will accept symbols in passwords, such as “=”, “%”, “!”, “+”. Strangely the dollar symbol is accepted. The following error message is generated; [...]