Dynamics AX 2012R3 - CRM 2013 Integration.

Hi good people,

I hope there is someone who has successfully managed to integrate AX 2012R3 and CRM 2013.
I am doing this integration, I want to the systems to synchronize Customer data between them(AX & CRM).

So far, data from AX to CRM is ok - i.e, data can move from AX to CRM.

However, there is no data that is moving from CRM to AX. No errors not nothing.

Has someone done this successfully before-even in lower versions of AX & CRM?

Kindly share with me, Maybe am doing the mappings wrong, I don’t know.