This restriction has been done to protect the application from XSS attack ( cross site scripting ).
You can try by disabling XSS protection.
Steps
Open the following file:
LOBTools.war/WEB-INF/web.xml
WebSphere Commerce Developer LOBTools/WebContent/WEB-INF/web.xml
See Management Center Web application file locations for more information.
Search for and remove the following snippet:
com.ibm.commerce.security.crosssitescriptingprovider
com.ibm.commerce.foundation.internal.client.security.impl. ClassicCommerceCrossSiteScriptingProviderImplSave your changes and close the file.
Deploy your changes.
But please keep in mind that by doing so you are making your app vulnerable to XSS attack.