Indicator for planning integration cannot be changed

What causes this issue?

You tried to change the indicator for integrated planning in master
data. This indicator may only be altered under the following
conditions:

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

Unit costing was never done on the affected job. In other words, no
unit costing exists that was then undone.
Planning data was not entered in the job.
or
If planning data was entered, the following applies:
In the plan version, integration with Cost Center Accounting is not
active
or
All plan values and quantities from internal allocations are zero
and
The 'Integrated planning' indicator (line item update and posting to
other applications) is not set in the fiscal year dependent data of the
plan version.
However, data exists in your object for plan version &V1& and fiscal
year &V2&.

System Response

You cannot change this indicator.

How to fix this error?

Undo the changes to the integrated planning indicator
or
correct the affected planning data if possible and then set the
indicator.

Error message extract from SAP system. Copyright SAP SE.