How To Fix MD128 - Fecha inic.sólo valida para entradas fijas

SAP Error Message - Details

• Message type: E = Error

• Message class: MD - Material Requirements Planning (MRP)

• Message number: 128

• Message text: Fecha inic.sólo valida para entradas fijas

¿Qué causa este problema?

You want to take firmed receipts/issues into account and have scheduled
the start of the planning period.

Respuesta del sistema

The start date of the planning period is valid for independent
requirements but not for firmed receipts/issue.
Otherwise, production orders, for example, could be included in the
planning run without considering the reservations earlier on the time
axis.

¿Cómo arreglar este error?

It is less effective to set a start date in the future that takes
firmed receipts/issues into account.
It is more effective to schedule a start date in the past if the
independent requirements in the past (but after start date) are also to
be taken into account.
If a start date is not scheduled, independent requirements in the past
are not taken into account.

Extracto de mensaje de error del sistema SAP. Copyright SAP SE.