How to avoid warning "'version' contains an expression but should be a constant" in maven for parent?

After reading the answer

I modified parent pom.xml and now it looks like this:

(based on https://github.com/apache/guacamole-client/blob/main/pom.xml):

<project xmlns="http://maven.apache.org/POM/4.0.0"    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0                        http://maven.apache.org/maven-v4_0_0.xsd"><modelVersion>4.0.0</modelVersion><groupId>org.apache.guacamole</groupId><artifactId>guacamole-client</artifactId><packaging>pom</packaging><version>${revison}</version><name>guacamole-client</name><url>http://guacamole.apache.org/</url>    ...<properties>        <revison>1.0.0</revison>         ...</properties>    ...

But I still see warning when I do mvn clean package:

[WARNING] [WARNING] Some problems were encountered while building the effective model for org.apache.guacamole:guacamole:war:1.0.0[WARNING] 'version' contains an expression but should be a constant. @ org.apache.guacamole:guacamole-client:${revison}, C:\work\my_project\guacamole-client\pom.xml, line 29, column 14[WARNING][WARNING] Some problems were encountered while building the effective model for org.apache.guacamole:guacamole-client:pom:1.0.0[WARNING] 'version' contains an expression but should be a constant. @ org.apache.guacamole:guacamole-client:${revison}, C:\work\my_project\guacamole-client\pom.xml, line 29, column 14[WARNING][WARNING] It is highly recommended to fix these problems because they threaten the stability of your build.[WARNING]

maven version is 3.8.1

Is there way to fix it ?

P.S. After I applied the advice from the topic - warnings for child projects are disappeared and I still have warning for parent