ITS_UNDEFINED_NAT_FUNCTION SAP ABAP Runtime Error its undefined nat function

ITS_UNDEFINED_NAT_FUNCTION is an ABAP runtime error which you may come across when using or developing within an SAP system. See below for the standard details explaining what it means and how you can avoid or fix this runtime error.

Short Dump Classification: B - ITS Error

You can view further information about a runtme error by using transaction code ST22 which will show you this and all runtime erros that have happen in your SAP system.

Also check out the Comments section below to view or add related contributions and example screen shots.

ITS_UNDEFINED_NAT_FUNCTION ABAP Runtime Error

If the error occurs in a non-modfied SAP template, you might be able to find a solution in the SAP Notes system.
If you have access to the SAP Notes system, check there first using the following keywords: ITS_UNDEFINED_NAT_FUNCTION
<runtime parameter> Template interpretation terminated, runtime error. Call transaction SE80 and check the HTMLB program.
In SE80, choose 'Internet Service' and navigate to the corresponding template. Take the service, theme and template name from the path of the template causing the error:
<runtime parameter>.
Remember to publish the corrected template on the 'INTERNAL' site in order to activate the change. Please see its error for more details about the possible cause of this runtime error and how it could be avoided.

Local funktion <runtime parameter> could not be found and therefore could not be called.
Check whether the function definition exists. Check for spelling mistakes in the function name and module name.

HTMLB example, error ITS_UNDEFINED_NAT_FUNCTION:
`declare funcA() in "moduleA.html"`

`funcA()` <- error, funcA() not defined Template <runtime parameter> has caused a runtime error in function <runtime parameter>. Cause of error: Function <runtime parameter> not defined.