How to post TestLink's Issue descr. as JIRA's custom field

[skyris]

How to post TestLink's "Issue Description" only as JIRA's custom field?
In my case JIRA's "customfield_10013" is text field "Steps to Reproduce".
Integration TestLink (1.9.18) + JIRA (7.1.9) = OK

<issuetracker>
<username>jira.user</username>
<password>jira.user.pass</password>
<uribase>https://my.jira.site/</uribase>
<uriapi>https://my.jira.site/rest/api/latest/</uriapi>
<uriview>https://my.jira.site/browse/</uriview>
<userinteraction>0</userinteraction>
<projectkey>WMO</projectkey>
<issuetype>1</issuetype>
<issuepriority>4</issuepriority>
<!--
<attributes>
<customFieldValues>
<customField>
<customfieldId>customfield_10013</customfieldId>
<type>freetextfield</type>
<values><value>steps_to_reproduce</value></values>
</customField>
</customFieldValues>
</attributes>
-->
</issuetracker>