How To Fix SYSTEMSWITCH028 - Blocking/unblocking transactions: parameter & is wrong

SAP Error Message - Details

• Message type: E = Error

• Message class: SYSTEMSWITCH - Messages for System Switch

• Message number: 028

• Message text: Blocking/unblocking transactions: parameter & is wrong

What causes this issue?

The function module PP_TRANSACTION_LOCK_UNLOCK was called incorrectly.

System Response

Possible values for LOCK are:
SPACE -> Do not lock PP transactions.
X -> Lock PP transactions.

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Possible values for UNLOCK are:
SPACE -> Do not unlock PP transactions.
X -> Unlock PP transactions.
LOCK and UNLOCK cannot have the same value simultaneously.
Possible values for COMMIT are:
SPACE -> No update of the locks/unlocks within the
function module.
X -> Update of the locks/unlocks within the
function module.

How to fix this error?

Check the input parameters.

Error message extract from SAP system. Copyright SAP SE.