https://community.graphisoft.com/t5/Archicad-C-API/Bug-ACAPI-Attribute-Modify-clears-an-UserData/m-p/121567#M6771 <DIV class="actalk-migrated-content">It looks like annoying bug.<BR />If you attach an userData by ACAPI_Attribute_SetUserData, and after it do ACAPI_Attribute_Modify, the UserData will cleared.<BR />( it is tested on AC11 for layers, didnt try on later APIs )<BR /><BR />GS, please, add this bug to the bug list. <BR /><BR />Oleg.</DIV> Thu, 03 Aug 2023 11:38:29 GMT Oleg 2023-08-03T11:38:29Z https://community.graphisoft.com/t5/Archicad-C-API/Bug-ACAPI-Attribute-Modify-clears-an-UserData/m-p/121567#M6771 <DIV class="actalk-migrated-content">It looks like annoying bug.<BR />If you attach an userData by ACAPI_Attribute_SetUserData, and after it do ACAPI_Attribute_Modify, the UserData will cleared.<BR />( it is tested on AC11 for layers, didnt try on later APIs )<BR /><BR />GS, please, add this bug to the bug list. <BR /><BR />Oleg.</DIV> Thu, 03 Aug 2023 11:38:29 GMT https://community.graphisoft.com/t5/Archicad-C-API/Bug-ACAPI-Attribute-Modify-clears-an-UserData/m-p/121567#M6771 Oleg 2023-08-03T11:38:29Z