kaushikd8293660 I have tested the same at my end and it works after replacing the below 2 lines in post.POST.jsp<%@taglib prefix="sling" uri="http://sling.apache.org/taglibs/sling/1.0" %> <%@taglib prefix="cq" uri="http://www.day.com/taglibs/cq/1.0" %> I hope this is helpful.

@vivek1108 Association is just like join, which we use to read data from two or more tables.For inserting data into 2 tables on the click of a button, you can invoke 2 insert service (one for each table).

@JoelLucuik  I have tested the same using AEM forms designer 6.5 and it's working for me.Refer to the attached sample.  

@BibhuNayakPlease add the one highlighted in my screenshot.

@BibhuNayak Please share the screenshot of “DeserializationFirewallImpl” configuration at your end.

@jmackesyLet me know the AEM forms version that you have.I will check this and get back to you.

@Eric_Stricker When exactly you are observing this issue? Please share the logs/snippet of log for review.

@BibhuNayak I just want you to add "[" in the deserialization whitelist configuration(refer screenshot in previous comment) and save it.

@BibhuNayak Please locate “DeserializationFirewallImpl” configuration under configMgr( http://<hostname>:<portno>/system/console/configMgr)  and add [ like below.I hope this will help.

@Belinda_Please validate if your GET/PUT services are working fine using Test Model Object.Please refer to the video at [1] .[1]. https://helpx.adobe.com/experience-manager/kt/forms/using/Integrate-AEM-Forms-With-Dynamics-365.html