topic Re: Character padding limit in expressions in Project data & BIM

Character padding limit in expressions

Abraham Smith — Fri, 28 Nov 2025 17:58:10 GMT

Hello, I'm having a problem with expressions that I haven't encountered before, and I hope you can clarify my doubt.

I've been doing some translations using the "SUBSTITUTE" expression, based on a previous expression that takes as values some acronyms from the name of the Composite or Complex Profile, also modeled with walls. The issue is that if I call another "SUBSTITUTE" expression, I get an "Unknown Error" which limits my ability to create a translation database for these acronyms, but I can't find a way to overcome that limit. See images below:

No errors

"Unknown Error"

I look forward to your comments. Regards

Operating system used: Windows 11

Re: Character padding limit in expressions

Laszlo Nagy — Tue, 02 Dec 2025 22:51:43 GMT

I wonder if it is the sheer number of nested functions in the Expression that is causing the error.

You could try reducing the number of SUBSTITUTE functions in the Expression and see if it works.

Or, you could start from the other direction: start with only 5-10 SUBSTITUTE functions and increase them gradually, see if you hit some limit where the error message starts occurring.

So, basically, you should start debugging the Expression.

Re: Character padding limit in expressions

Abraham Smith — Wed, 10 Dec 2025 15:40:25 GMT

Hi Lazlo, thanks for your reply.

I ran some tests and found that the limit is 59 "SUBSTITUTE" functions, because if I reach 60 functions, I get an unknown error. I'm sharing screenshots below.

59 "SUBSTITUTE"

60 "SUBSTITUTE"

Is there any way to increase the limit to at least 100 functions?

I did the same test calling this property with 59 "SUBSTITUTE" functions, and I can add another 59 functions. I did it three times, and it keeps calling without any problem.

Could this be a limitation of the expression window?

Is there any way to increase the number of functions allowed in the expression window?

I look forward to your response.

Re: Character padding limit in expressions

Laszlo Nagy — Wed, 10 Dec 2025 18:27:17 GMT

If creating three expressions is a viable route for you, I would recommend that for now. If this is indeed a limitation in Archicad, we will not be able to circumvent it or modify it; only the developers can do that.

I would also recommend that you report this to your local reseller, so they can investigate and confirm if this is a bug or a limitation.

Re: Character padding limit in expressions

Abraham Smith — Sat, 10 Jan 2026 18:24:01 GMT

Hi Laszlo, I hope you had a wonderful holiday season. Thanks for the replies. I think it will work that way, creating more properties that integrate with the previous one if needed. Regards