rs!key=me!Felt virker ikke ved GUID- Access VBA

well if its working on one form then there is obviously something which is not the same. Double check your code and data types.
Also try debugging to see what lstShrimpSample actually contains before update

I have checked what the field lstShrimpSample contains and it is in fact a GUID Key value.

The data types are both GUID.

The only difference that I can find is that the table that I try to write to is in the application that I am writing and not in a linked table.

The application is supposed to have several copies linked to the main database. In each application copy someone will measure some shrimp and then upload them to the main database. Hence the local vs linked tables.

Is there any chance of seeing a copy of the dB, or at least the parts which are giving you problems?

ekspertenATsanthell.dk
AT = @

Is it possible to send a copy somewhere ?

you got my email (zip file please) ;-)

main and linked dB too

?

I work a bit sporadically in the fall because of other work, so I may answer with some delay.

solution for other users.
https://docs.microsoft.com/en-us/office/vba/api/access.listbox.boundcolumn

In the listbox lstShrimpSample the column width for the first column was originally > 0 (visible)

This also has an effect on BoundColumn which you can read about in the link above, although it doesn’t explain very well.

So, if the column width is 0, then you can get the value of that column using  EG: Me! lstShrimpSample, but if it is visible (greater than 0)  then you should use the column number EG: Me! lstShrimpSample.Column(0).

So if you change the column width to 0, or use column number .column(0) it should work.