When attempting to change the maximum size of a custom string attribute on the Investment object and clicking on Save, the change is saved, but the following error is thrown:
Release: CODFSS99000-15.3-PPM SAAS FedRAMP-Sandbox-Small Environment
This error will occur if the attribute is checked to 'Include in the Data Warehouse' and an attempt is made to change the attribute details. To avoid this error, first exclude the attribute from the Data Warehouse, make the change to the attribute and save. Once this change is saved, then check the 'Include in the Data Warehouse' option and save again.