I need a way to make the user write into a field and the lock the fiel, that the user is not allowed to modify it what he just wrote. How can I do that?

 

Thank you

You could display two fields on the layout, one that allows you to edit the field, and hide that field when the value is not empty, and another field that only shows the value and is not editable.

Read about Field Validation, and Planning Security for a file

This need come up from time to time, do this search for some past posts about it.

Site: fmforums.com field locking

I would start by making sure i know exactly why edit once and lock forever is a requirement.

This may lead you to a better method of meeting users needs with a design change.

If it is an actual requirement and the problem can not be solved with design changes then see Lee's post or figure out some way of accomplishing your goal transactionally. IMHO the transactional aproach is not a beginner level approach.

Thank you very much!!! I will try your advise!

I need a way to make the user write into a field and the lock the fiel, that the user is not allowed to modify it what he just wrote. How can I do that?

 

Filemaker has a built-in mechanism where you can allow users to create new records and modify these until the end of the current session - but not edit already existing records. This is usually the most reasonable arrangement, as it allows users to correct their mistakes.