Have you been in the case to provide justification of monthly income ( pension, dividend, property rental, investment...etc ) to the immigration in order to meet full or partial financial requirement for your visa ( marriage or retirement ) ?
If yes, did you fill in a specific form or write a letter to be signed by your embassy ? Did you have to bring justification, like bank statement from your home country, taxes paid in your home country, organism of pension, etc...
Did you have any concerns with your local immigration office to accept this affidavit ?
Any useful and relevant informations are welcome, whichever your nationality and your specific case, this can help anybody to know the procedure to follow.