E-Mail attachments from a net-share con not be send after Update to V21.0.7

Products

• CA Automic Workload Automation - Automation Engine

Issue/Introduction

After the update from V21.0.5 to V21.0.7 HF1 it´s not possible to send mail attachments which are located on a Net share. 

The mail will be send but the attachmants are missing. 
Before the update in V21.0.5 the attachmants were send.
Attachments from a local drive will be send without problems. 
SEND_MAIL returns a RD50013 which is not listed in the Automic Help. 

a google-search indicates that RC50013 may be a loginproblem. 

The WP has a property configured in the servicemanager dialog that contains the usercredentials from the user with access to the share. 
The ServiceManager log indicates, that the domain login is successfull with that user. 

Are there changes in the mail send process?

Environment

Release : 21.0.7

Cause

There was a change 21.0.6 release with "Sending Secure Emails via the Automation Engine".

The JWP now processes the mail operations. For more details please refer to the following product documentation.

What's New in 21.0.6

Resolution

The user credentials were not entered in the JWP. 

Updating the service manager dialog with the user credentials, with the domain user having access to the network share, resolved the issue.