Making selections in a multibox via a formula match()+concat()

[#1]

Hi,

i  want to be able to make a selection via a formula in a multibox.

I know this is possible, as I have seen this be used through triggers before.

Furtermore, copying the text the string generates into the multibox also does the trick.

Copying the formula itself however does not work. I have tried to play around with " ' " but have been without succes up to now.

I think I am very close...?

='=match('&'warehouse_1'&chr(44)&chr(39) &concat({1<warehouse_1={'01','14'}>} warehouse_1,chr(39)&chr(44)&chr(39))&chr(39)&chr(41)