custom field related to another

[morrissey]

here we go again.

i created a custom field under contact (Customer ID). There we fill in our internal customer number. I want to appear this field with the customer number also when i write an invoice etc. Menas: I create an invoice and the customer number is prefilled from contacts. How do i connect the field under contact to a custom field also called Customer ID in Invoice for instance ? Like the system prefill all other datas company name, street etc.

thX

[morrissey]

searched the whole forum. found some examples but it dont work or im simply to dump. that it is so difficult to copy one field to another module i didnt expect. Im tired. Ill give upt and look for a easier system