A strange thing happens to me :
I have a command button links between two forms. For some starnge reason once I use it, an error message pops up. When I enter the code and use Me. the options I see are customer_CustomerID instead of Customer.CustomerID and the program cannot identify the field although everything seems to be all right in the form itself.
I guess my explanation is not very clear, but does anyone know what can be the reason?

If you really have a text box named Customer.CustomerID then you should change it for something like say txtCusID take a look at naming conventions too, you shouldn't use dots or spaces in field names.

I know I should use the right prefix
however, Access automatically generates the names of the fields for me.. so I left the given names as they are.
What about the problem I encountered
Do you have any solution?

VB and VBA being real programming languages have much stricter rules than Jet and Access on how object names must be formed. When you are in a code module of any type, you must follow VBA rules. Access is converting the offending character (.) to an underscore (_).

Either change the field name in the table or query so that it does not contain illegal characters or change the control name.

Thanks. I have managed to fix the problem