What causes this issue?

You have assigned a placeholder to component &V2& of form data class
&V1&. The end symbol of the placeholder is missing.

System Response

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

How to fix this error?

1) Start transaction SM30 and enter view V_T7PBSCA6C with country
grouping 01. In the line with data class &V1& and element &V2&, enter
the second missing "<(>&<)>? symbol under header (content).
2) If the entry is not available, start transaction SM30 and enter view
V_T7PBSCA6B with country grouping 01 and data class &V1&. Add the second
missing "<(>&<)>? symbol at element &V2& under header (content).

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.