How To Fix WO808 - Parameter type & does not allow & (only E or I)

SAP Error Message - Details

• Message type: E = Error

• Message class: WO - WF: Messages for Workflow Wizards

• Message number: 808

• Message text: Parameter type & does not allow & (only E or I)

What causes this issue?

You have passed an internal table of the structure RSPARAMS. The field
SIGN contain a value that is not permitted. If the field KIND contains
the entry 'S', the field SIGN can only contain 'I' or 'E'.

System Response

The method was terminated with an exception.

How to fix this error?

Check the table entries (the field KIND is in the 9th place and the
field SIGN in the 10th place in the character string). Start the task
again.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message WO808 - Parameter type & does not allow & (only E or I) ?

  The SAP error message:
  WO808 Parameter type & does not allow & (only E or I)
  Explanation / Cause:
  This error occurs when a parameter type is specified incorrectly in a function module, report, or user exit related to workflow or other SAP processes. The message indicates that the parameter type provided is neither E (Exporting) nor I (Importing), which are the only allowed parameter types in this context.
  In SAP, when defining parameters for function modules or workflows, the parameter type must be one of the following:
  
  I = Importing parameter
  E = Exporting parameter
  
  If a parameter is defined as C (Changing), T (Tables), or any other type, the system throws this error because the workflow or the specific process expects only Importing or Exporting parameters.
  Typical Scenario:
  
  You are creating or modifying a function module or a workflow step.
  You assign a parameter type other than E or I.
  The system validates the parameter types and throws this error.
  
  How to Fix / Solution:
  
  Check the parameter type in the function module or workflow step where the error occurs.
  Change the parameter type to either E (Exporting) or I (Importing) as required.
  Save and activate the function module or workflow.
  
  Steps to Correct:
  
  Go to the function module (transaction SE37).
  Open the interface tab.
  Check the parameter types.
  Change any parameter type that is not E or I to one of these two.
  Save and activate.
  
  Additional Information:
  
  This error is common in workflow development or when integrating custom function modules with SAP workflows.
  The restriction to only E or I parameters is because workflows can only handle importing and exporting parameters, not changing or table parameters.
  If you need to pass tables or changing parameters, consider redesigning the interface or using structures that can be passed as importing/exporting parameters.
  
  
  Summary:
  
  
  
  Aspect
  Details
  
  
  
  
  Error message
  WO808 Parameter type & does not allow & (only E or I)
  
  
  Cause
  Parameter type is not E (Exporting) or I (Importing)
  
  
  Solution
  Change parameter type to E or I in function module or workflow
  
  
  Context
  Workflow or function module parameter definition
  
  
  
  If you provide the exact parameter and its current type, I can help you with the exact correction.