Informix 4GL question

Suppose you have an orders screen / function with an option to transfer to the customer screen. Suppose also your customer screen / function can transfer to the orders screen. Both functions can be called from a menu in main first, and both have an option to exit back to the main menu. Now, it is obviously possible to call customers then orders, then customer, then orders etc. and travel endlessly down many levels of the function / subroutine stack. In 4GL would this be good programming practice? What are your opinions on avoiding this problem, if it is one. Is it better to always return to the calling function before going into this spiral? Please reply to my email address as well as the newsgroup. Thank You.