Message no. AM202 occured when you e.g. create a new vendor or customer
When you e.g. create a new vendor or customer the system showed up the Message no. AM202 as follows:
To solve this issue you need to:
Goto transaction OY07 -> enter the Country for example NL, check the Postal code. Please change the Length to e.g. 7 in this case
and save. Now the postal code will have the correct length.
There will not be any effect on any vendor/customer you have with the old postal code until the customer is edited and data is changed,
then the system will preform ADDR_CHECK where it will check the postal code and an error will be thrown.
If/when you are editing a customer with the old postal code you should also edit the postal code to have the correct length and then no error will be thrown.