Passing additional Provider Task fields to the Consumer and obtaining FDS target sys_id's

[Shane_C]

(Transferring from post: Service Exchange - Data Security Summary Now Available in search of an answer...)

I am running into some issues with passing additional data via a Proactive Case (NOT via Remote Task) from the Provider instance to the Consumer instance.

In addition to the out-of-box (OOB) fields sent via the Proactive Case process, we are trying to pass some additional fields, from the Case to the Provider Task:

(Provider Instance) Case [sn_customerservice_case] Field	(Provider Instance) Provider Task [sn_sb_pro_provider_task] Field	(Consumer Instance) Provider Task [sn_sb_con_provider_task] Field
OOB Fields	OOB Fields	OOB Fields
Account [account]	Company [company]	Company [company] <Lists Provider Company>
Product [product]	Product [product]	Product [product]
Short description [short_description]	Short description [short_description]	Short description [short_description]
Description [description]	Description [description]	Description [description]
State [state]	State [state]	State [state]
<Case Record>	Parent [parent]	<Listed as the Provider task [provider_task]: Number only>
<Consumer connection record>	Consumer connection [consumer_connection]	<Provider connection [provider_connection] is listed instead>
Additional comments [comments]	Additional comments [comments]	Additional comments [comments]
<Script: contact.email or account.primary_contact.email>	Requestor email [requestor_email]	Requestor email [requestor_email]
Number [number]	Provider task [provider_task]	Provider task [provider_task]
<Script, returns Customer Service by default>	Application [application]	<Does not appear to be used, value on target is global>
Priority [priority]	Priority [priority]	Priority [priority]
<Script including close_notes and resolution_code>	Resolution notes [close_notes]	Resolution notes [close_notes]
Additional Fields	Additional Fields	Additional Fields
Configuration Item [cmdb_ci]	Configuration Item [cmdb_ci]	✖ Configuration Item [cmdb_ci]
Channel [contact_type]	Contact Type [contact_type]	✖ Contact Type [contact_type]
Actual start [work_start]	Actual start [work_start]	✔ Actual start [work_start]
Actual end [work_end]	Actual end [work_end]	✔ Actual end [work_end]
Correlation ID [correlation_id]	Correlation ID [correlation_id]	✖ Correlation ID [correlation_id]

(NOTE: The associated CI's are included in FDS from the Provider to the Consumer instance)

Values pass from the sn_customerservice_case to the sn_sb_pro_provider_task without issue, but primarily, only the original OOB fields seem to pass to the sn_sb_con_provider_task. (Most  ✖ fail, but surprisingly Actual Start and Actual end  ✔ passed across.)

How can this be achieved without requiring customization/changes on the Consumer instance?
We are currently running Service Exchange for Providers v2.3.29

Also, I am interested to know if the provider instance is able to somewhat independently obtain the consumer target record sys_id utilizing FDS and the associated source sys_id as a component.

A lengthier use case-example version on a targeted value:
From a ServiceNow Service Exchange for Providers v2.3.29 instance... 
if we are using FDS to push Configuration Items and their updates to a Consumer instance (without maintaining the same sys_id's), can we utilize the FDS process in combination with PSBScratchpadUtil when creating a provider initiated Proactive Case (Provider Task [sn_sb_pro_provider_task]) record
to ensure the Configuration Item [cmdb_ci] record set on the Provider Task [sn_sb_pro_provider_task] record can properly associate the corresponding FDS Configuration Item [cmdb_ci] record in the Consumer instance associated Provider Task [sn_sb_con_provider_task] (without customizing the Consumer instance) and without knowing with certainty how the target cmdb_ci record is mapped on the consumer instance, whether they processed the FDS data via the Integration Hub ETL / Identification and Reconciliation Engine (IRE) or standard Service Exchange staging mappings or transforms?