@ Ilham:
Perhaps you mean the maximum digits.
There is no maximum digit limit, Sir, instead there is a minimum digit limit, ranging from 0.5 to 10 pips depending on the broker. For example, for a broker that applies a minimum stop and limit rule of 5 pips, if you buy at 1.23400 then the minimum stop loss is 1.23350 and the minimum take profit (limit) is 1.23450 (in a 5-digit base). The reference is the price when you open the position or the market price at that time if you make modifications to the stop or take profit levels you have previously set.
But there is no maximum limit, and as far as I know, no broker has limited the maximum level of stop and limit.
Here are brokers that apply the minimum distance rule for stop and limit levels:
FBS - for EUR/USD the minimum distance for stop and limit is 2 pips
FXTM - the minimum distance for stop and limit is 0.5 pips to 2 pips (in a 5-digit base)
FXOpen - the minimum distance for stop, limit and pending orders is 10 pips.