To prevent fraud, you are obliged to number and date the books continuously and consecutively. e-Captain does this for you so you do not have to look at it. In addition, make sure you have good references in your bookkeeping so that you (and your accountant!) Can quickly find the supporting documents.
It is very sensible to keep the administration in order with regular regularity. So you are always aware of the state of affairs and you can not forget anything to your disadvantage. In addition, a well-kept administration can save you a lot of time and money. Many starting entrepreneurs go under because their administration is a mess!
The retention obligation for the entire administration is 7 years, in some cases there are exceptions to this rule.