This article describes a known issue in the Forms portlet when upgrading from DXP 7.0 to DXP 7.1+. During the upgrade, a validation error is thrown as follows:
Unable to upgrade the visibility expression "equals(Options, "Others") then abc" to a form rule
com.liferay.dynamic.data.mapping.expression.DDMExpressionException$InvalidSyntax: The expression syntax is invalid.
The reason why this error is thrown is due to the upgrade process' validation check against existing form data. While this specific syntax may have been permitted in a previous version of Liferay, or in a previous patch version of the earlier version of Liferay, subsequent DXP versions (7.1+) of Liferay identify it as invalid syntax.
Liferay Engineering is aware this is a bug; expressions that are valid in DXP 7.0 should not become invalid in DXP 7.1+, but should instead be supported. See LPS-89933.
For a short-term resolution, go back to your current pre-upgrade environment and modify the form which contains the problematic syntax:
- Remove the expression prior to the upgrade to DXP 7.1+ version.
- Run the upgrade to DXP 7.1+
- Once you are in DXP 7.1+, add the expression with the valid syntax for this product version.
For a long-term resolution, please wait for the final resolution of LPS-89933.