I’m working with an Aggregate API configuration. I have defined query parameters oc and cid in my API definition, but when I make requests, these parameters seem to be empty or not populated correctly. This issue leads to errors like INCOMPATIBLE_PARAMETERS_ERROR and NumberFormatException.

Here is my API configuration:
`

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                    <property expression="get-property('response')" name="userResponse" scope="default" type="STRING"/>
                </sequence>
            </target>
            <target>
                <sequence>
                    <call>
                        <endpoint>
                            <http method="get" uri-template="http://localhost:8290/services/officesDS/getOffice?OfficeCode={oc}">
                                <suspendOnFailure>
                                    <initialDuration>-1</initialDuration>
                                    <progressionFactor>1</progressionFactor>
                                </suspendOnFailure>
                                <markForSuspension>
                                    <retriesBeforeSuspension>0</retriesBeforeSuspension>
                                </markForSuspension>
                            </http>
                        </endpoint>
                    </call>
                    <log level="full" separator=",">
                        <property expression="get-property('response')" name="Office Service Response"/>
                    </log>
                    <property expression="get-property('response')" name="officeResponse" scope="default" type="STRING"/>
                </sequence>
            </target>
            <target>
                <sequence>
                    <call>
                        <endpoint>
                            <http method="get" uri-template="http://localhost:8290/services/productsDS/getProduct?category_id={cid}">
                                <suspendOnFailure>
                                    <initialDuration>-1</initialDuration>
                                    <progressionFactor>1</progressionFactor>
                                </suspendOnFailure>
                                <markForSuspension>
                                    <retriesBeforeSuspension>0</retriesBeforeSuspension>
                                </markForSuspension>
                            </http>
                        </endpoint>
                    </call>
                    <log level="full" separator=",">
                        <property expression="get-property('response')" name="Product Service Response"/>
                    </log>
                    <property expression="get-property('response')" name="productResponse" scope="default" type="STRING"/>
                </sequence>
            </target>
        </clone>
        <aggregate>
            <completeCondition>
                <messageCount max="-1" min="3"/>
            </completeCondition>
            <onComplete aggregateElementType="root" expression="json-eval($)">
                <log level="full" separator=",">
                    <property expression="json-eval($)" name="Aggregated Response"/>
                </log>
                <property expression="json-eval($)" name="aggregatedResponse" scope="default" type="STRING"/>
                <log level="full" separator=",">
                    <property expression="get-property('aggregatedResponse')" name="Final Aggregated Response"/>
                </log>
                <respond/>
            </onComplete>
        </aggregate>
    </inSequence>
    <outSequence/>
    <faultSequence/>
</resource>

`

and the error i am encoutering :

<DataServiceFault>
            <current_params>{category_id=}</current_params>
            <source_data_service>
                <data_service_name>productsDS</data_service_name>
                <description>Service to expose product data</description>
                <location>C:IntegrationStudioruntimemicroesbtmpcarbonapps-12341718856451086TestCompositeApplication_1.0.0.carproductsDS_1.0.0productsDS-1.0.0.dbs</location>
                <default_namespace>http://ws.wso2.org/dataservice</default_namespace>
            </source_data_service>
            <ds_code>INCOMPATIBLE_PARAMETERS_ERROR</ds_code>
            <nested_exception>java.lang.NumberFormatException: For input string: ""</nested_exception>
            <current_request_name>_getgetproduct</current_request_name>
        </DataServiceFault>

For some reason the parameters are not being populated correctly.