SAP Message AD755 - Obtain approval for structure changes from head of development

Diagnosis
++++ Restrictions applying to SAP development systems +++++
Reason:
-> Check of structure changes that could possibly result in lengthyconversions in customers systems.
If a table in a customer system contains a large volume of data, tableconversion of a single table may take several hours. For a Releaseupgrade we supply over 20,000 DDIC objects (Rel. 3.0), includingthousands of DB tables. Such a check intended to keep time-consumingconversions to the minimum is therefore inavoidable.
If, as an application developer, you run up against this barrier,please consult the DDIC contact person responsible for your
area.
Regards,
Your Q team