3681894 - Internal error in the spool system when calling function module in target system

The following errors occur when migrating data using the Migration Cockpit:

DMC_RT_MSG 231 - System error occurs when calling function module in target system
DMC_RT_MSG 39 - System error (portion 0000000001, conversion object <Migration Object name>, at XXXXXX)
DMC_RT_MSG 41 - Internal error in the spool system (conversion object <Migration Object name>)

In ST22, the following dump can be seen:

Category               Internal error
Runtime Errors         SPOOL_INTERNAL_ERROR
Application Component  Not assigned
Date and Time          11.11.2025 00:09:42 (UTC+3)
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|Short Text                                                                                        |
|    Internal error in the spool system.                                                           |
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|What happened?                                                                                    |
|    Error in the SAP kernel                                                                       |
|                                                                                                  |
|    The current ABAP program "SAPLKKBL" had to be terminated because the ABAP                     |
|    processor detected a system error.                                                            |
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• S/4HANA Migration Cockpit

system error, function module, target system, s/4hana migration cockpit, spool overflow, spool system error, DMC_RT_MSG 231, DMC_RT_MSG 39, DMC_RT_MSG 41, fixed assets, conversion object Z_FIXED_ASSET_M0R, SAPLKKBL, SPO_NUM , KBA , CA-LT-MC , S/4HANA Migration Cockpit , Problem