Custom App is working from Gateway URL but not if we are using Reverse Proxy

Dear Experts,

We have deployed the Custom Fiori App in our Dev Landscape. The weird part is, it is working if we are running the Fiori Launchpad as below>>

https://<Gateway System FQDN>:<Port>/sap/bc/ui5_ui5/ui2/ushell/shells/abap/FioriLaunchpad.html?sap-client=<Client No>&sap-language=EN

And its working perfectly fine.

On the other hand, we are running the Fiori Launchpad using https://<Reverse Proxy URL>/sap/bc/ui5_ui5/ui2/ushell/shells/abap/FioriLaunchpad.html?sap-client=<Client No>&sap-language=EN

Then its not working and giving us an error as below,

015-09-18 18:33:19 Application initialization failed due to an Exception:

Error: The specified component controller 'hcm.myleaverequest.Z_LRQ_CRE_EXT.Component' could not be found!

    at g (https://<reverse proxy FQDN>/sap/bc/ui5_ui5/ui2/ushell/resources/sap/fiori/core-min-1.js:16:57774)

    at Function.sap.ui.component.load (https://<reverse proxy FQDN>/sap/bc/ui5_ui5/ui2/ushell/resources/sap/fiori/core-min-1.js:16:58466)

    at Object.sap.ui.component (https://<reverse proxy FQDN>/sap/bc/ui5_ui5/ui2/ushell/resources/sap/fiori/core-min-1.js:16:57301)

    at j (eval at <anonymous> (https://<reverse proxy FQDN>/sap/bc/ui5_ui5/ui2/ushell/resources/sap/fiori/core-min-3.js:11:37278), <anonymous>:592:24496)

    at v (eval at <anonymous> (https://<reverse proxy FQDN>/sap/bc/ui5_ui5/ui2/ushell/resources/sap/fiori/core-min-3.js:11:37278), <anonymous>:592:30184)

    at x (eval at <anonymous> (https://<reverse proxy FQDN>/sap/bc/ui5_ui5/ui2/ushell/resources/sap/fiori/core-min-3.js:11:37278), <anonymous>:592:30588)

    at Object.jQuery.sap.registerPreloadedModules.modules.sap/ushell/components/container/ApplicationContainer.js.sap.ui.core.Control.extend.renderer [as render] (eval at <anonymous> (https://<reverse proxy FQDN>/sap/bc/ui5_ui5/ui2/ushell/resources/sap/fiori/core-min-3.js:11:37278), <anonymous>:592:34057)

    at R.renderControl (https://<reverse proxy FQDN>/sap/bc/ui5_ui5/ui2/ushell/resources/sap/fiori/core-min-1.js:16:187427)

    at null.renderControl (https://<reverse proxy FQDN>/sap/bc/ui5_ui5/ui2/ushell/resources/sap/fiori/core-min-1.js:16:144)

    at Object.jQuery.sap.registerPreloadedModules.modules.sap/m/ShellRenderer.js.sap.ui.define.S.render (eval at <anonymous> (https://<reverse proxy FQDN>/sap/bc/ui5_ui5/ui2/ushell/resources/sap/fiori/core-min-3.js:11:37278), <anonymous>:472:103317) - 

Any idea on this error?

FYI: We are on latest release of SAP UI and SAP UI5 Libs.

KR,

~ Mahendra