/SAPAPO/CURTO 103 : Mode .. is not assigned to an activity

Hi Colleagues,

We have a material (FERT), BOM

in the routing we created one alternative sequence, and one production version.

When we are trying to transfer PDS (pp/ds) via CIF the following error appears

/SAPAPO/CURTO 103 : Mode N50000003011000FERT-00003 5000 001000000003 P is not assigned to an activity

Message no. CURTO1009

What is this about, I have tried everything?

Thank you in advance.