• Issue / Problem Statement
• How to identify if FM is blacklisted?
• Checks before whitelisting
• How to whitelist the RFC?

Issue / Problem Statement

Some of the Remote enabled function modules are blacklisted in S/4 HANA.
Reason for blacklisting can be incompatible parameters in RFC or functionality is not yet prepared.

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How to idetify if Function Module is Blacklisted?

1. Execute the Report RS_RFC_BLACKLIST_COMPLETE
2. Enter the relevant package
   • S/4HANA OP Release # | Blacklist Package
   • S/4HANA OP 2021 | ABLMUCON2021
   • S/4HANA OP 2020 | ABLMUCON2020
   • S/4HANA OP 1909 | ABLMUCON1909
   • S/4HANA OP 1809 | ABLMUCON1809
   • S/4HANA OP 1709 | ABLMUCON1709
   • S/4HANA OP 1610 | ABLMUCON1610SP00
3. Hit Enter and it will display the list of FM’s

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Checks before Whitelisting

Before reactivating, please note the following:

• Some of the blocklisted objects are temporarily blocklisted and SAP may whitelist or allow its general usage by removing from the blocklist in any future support package and thus, an object that is removed from blocklist, when executed or used, will no longer show the short dump. 
• Consult with development support before reactivating a blocklisted object.
  1. Raise a ticket on the component of the blocklisted object concerned and inquire with the development support of S/4 HANA whether the particular object is temporarily or permanently blocklisted, whether the particular object can be re-activated by the customer and used or custom enhanced. 
  2. SAP development support may have a dialogue regarding what, why and how the blocklist object would be used by the customer and would reply whether it is feasible and safe to use the blocklisted object. 
  3. Based on the approval of development support via the ticket, the customer may proceed to activate using instructions mentioned below.
• However, please note that the development support’s approval on reactivating a blocklisted object in customer system as mentioned in this note would mean the customer reactivates at its own risk and SAP is not responsible for usage of the objects as long as they remain in SAP’s “Blocklist”, even when SAP approves its usage or custom enhancement.

Source: Note 2408693

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How to Whitelist RFC?

1. Execute report RS_RFC_BLACKLIST_CUSTOM
2. Enter the FM name and press enter
3. Unchek the options you need to whitelist
   • Block on Server
   • Block on Client
4. And Save it

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Related Notes

• 2295840 – Outbound / Inbound calls from external to RFC FM are blocked when the FM is blacklisted and the UCON-Check is active
• 2298711 – Maintain RFC Blacklist in customer installations
• 2416705 – Outbound / Inbound calls from external to RFC FM are blocked when the FM is blacklisted using Blacklist Object
• 2259818 – RFC enabled Function Modules with incompatible signature change compared to its version in ERP are blocked from external access.
• 2408693 – Override blocklist of Remote Enabled Function Modules

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