Could you please specify with which of all these client requirements you face problems and in which exact part of your setup?
From what you copy/pasted, it seems that your client's old system is again SAP, but they are probably on an older version.
Is the purpose of the project to simply replicate the setup from the old to the new system or they require certain logistics optimization on top of that?
If it is the first, request access to it, check what they actually do there and compare the official as-is scenarios to the real data. Use the opportunity to check their current setup and additional developments in the area: 1) you might get some good ideas from there, which can be re-used in the implementation; 2) there is always some important custom functionality, which the client forgets about during discussions and you will prefer to prevent that from backfiring at go-live. I am almost certain that thy have not told you the whole story behind the z-table, speak with the business to understand the complete end-to-end process.
If it is the second, please get a qualified consultant, who knows about that stuff, can handle the workshops with the client and propose a meaningful strategy. It usually means paying a higher rate, but logistics optimization is too important subject for any company, so it is a bad idea to be stingy about that.







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