GATP Product substitution

[Former Member]

Dear Friends

I have a query in SAP-APO 4.0 GATP, product substitution functionality.

I am undertaking a product substitution procedure for a component in a BOM .

i.e we want one component to be replaced by another component (in case of

non-availability of the component) . What we observed is when we maintained the

checking horizon(planned delivery time in R/3) for the said componet as 5 days

only then the product substitution seemed to work during the ATP check stage

(while creation of sales order) but the due date is getting pushed by the

checking horizon of the non-available material .My query was

a) Ideally if the substitute product is available at the plant I don't see

the reason why the due date is getting extended by the checking horizon ? What

could be the reason for the same?

b) When the checking horizon was changed from 5 days (both , <5 days & > 5

days) then product substitution did not occur and only the due date was getting

extended by the checking horizon .Why is the product substition not taking

place?

Request the group to share their insights & knowledge in helping me solve this

Thanking you in anticpation

rgds

Bipin Ballal

[Former Member]

Hi Bipin,

The behavior of the system is really strange if it shifts the due date by the no. of days in CH. Its also surprising that it works at a specific value.

I feel it has nothing to do with CH as it is only the no. of days beyond which the material is available indefinitely. Lets get into it a little deeper:

You are expecting a product substitution of a dependent material during Sales Order creation.

So it must be Rules based ATP with multi level ATP check. You will also be having CTP. Check the following settings:

1. PP Planning procedure; should be automatic planning or multilevel ATP.

2. Corresponding strategy group to be maintained in R/3 and the material should also have external planning.

3. Check your PPDS fixing horizon. If the due date is before this, it will shift the date.

4. In Maintain Check instruction: see that you have create remaining requirement at header level.

5. In multilevel ATP settings you should have remaining requirements at component level. And also define the business event it should happen during. I.e. while sales order creation or during automatic planning.

6. I hope your rule maintenance is working perfectly in check mode..

Hope this helps, or you can get back with more details.

Thanks & Regards

Santanu Dawn