Get input value from parametrized method - jsf

Question

I'm trying to fill my input with a value from a parametrized method as I can't access to this value directly with a getter.
<c:forEach items="#{operationBean.tableFields}" var="tableField" varStatus="status">
<rich:column>
<f:facet name="header">
<h:panelGroup>
<h:outputText value="#{operationBean.findLabel(tableField)}"/>
<h:inputText value="#{operationBean.filters[tableField]}" layout="block">
<a4j:ajax event="keyup" render="table" execute="#table"/>
</h:inputText>
</h:panelGroup>
</f:facet>
<c:choose>
<c:when test="#{operationBean.editableColumn(tableField)}">
<rich:inplaceInput value="#{operationBean.findOperationFieldValue(operation, tableField)}"
valueChangeListener="#{operationBean.changeOperationFieldValue}"
saveOnBlur="false">
<f:attribute name="tableField" value="#{tableField}"/>
<f:attribute name="operation" value="#{operation}"/>
<a4j:ajax execute="#this"/>
</rich:inplaceInput>
</c:when>
<c:otherwise>
<h:outputText value="#{operationBean.findOperationFieldValue(operation, tableField)}"/>
</c:otherwise>
</c:choose>
</rich:column>
</c:forEach>
Obviously, JSF tries to call a setter for the rich:inplaceInput, cannot find it, and throws
javax.el.PropertyNotWritableException: /faces/operations/table.xhtml #29,56 value="#{operationBean.findOperationFieldValue(operation, tableField)}": Illegal Syntax for Set Operation
I don't need this attempted call to a setter, as the valueChangeListenerdoes what I need.
I could create my own component and override UIInput.updateModel() but that would be a pain.