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FL389 – Only tables with flat line structure are allowed in RFC – SAP error message

The SAP message FL 389 can also appear if you are assigning a structure which contains a string field to a function module tables parameter. Within an RFC enabled function module it shows this message as a success message but will not let you save.

You get a slightly different message  with none RFC enabled functions modules but has the same effect “<TABLE> must be a flat structure. You cannot use internal tables, strings, references, or structures as components.

Using the function module tables parameter is obsolete so the simple solution would be to create a table type of your structure and then create a EXPORTING or CHANGING parameter based on this.

Create table type via transaction SE11
















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